Street legal electronically adjustable exhaust systems

Street legal

Dr. Jekill & Mr. Hyde | The Exhaust is a completely legal exhaust system that complies with European laws and is ECE, EG-BE and TÜV approved. The reason for this is that every Dr. Jekill & Mr. Hyde system contains a smartbox: this electronic control unit is the brain of the product and contains software that reads CANBUS signals coming from the motorcycle’s ECU.

By committing the system to the parameters set by EU legislation, the Smartbox will seamlessly and subtly intervene if necessary. Riders don’t have to worry about breaking the law in any situation; the system is always legal no matter what sound mode is selected. Our exhaust systems are fully compliant with the latest EURO norm. We care deeply about the environment, so all of our exhaust systems are built to achieve air quality standards.

That being said, we must also understand that we live in a crowded society where we have to accept that we also need to be considerate when it comes to the people around us, people that are maybe not at all charmed by the sound of a rumbling motorcycle. That is why at The Jekill and Hyde Company we offer you the possibility to adjust your sound to the moment. By doing this you can continue to carry out your favorite hobby, without disturbing others.

But do not just take our word for it, ask the proper authorities. Before we release a system it gets thoroughly tested by them and only when they approve it, a Dr. Jekill & Mr. Hyde | The Exhaust becomes available for your bike.

european type approval emission, sound and performance

What do the authorities test? To be 100% legal an exhaust system must meet the set requirements regarding emission, sound and performance.

The specially developed catalysts in our mufflers make sure that this requirement is met. Then there is performance. A Dr. Jekill & Mr. Hyde | The Exhaust gives you up to 5% more performance while riding with your valve opened*. When the system intervenes this happens so subtle, that when the valve gets closed any loss of performance barely noticeable, ensuring you a safe ride. Next up is sound.

Finally there is sound. Our software is programmed to intervene subtly and almost imperceptibly when the parameters set by the legislation are reached. This ensures that you are 100% legally on the road in all riding modes. The system comes with a credit-card sized certificate that has your unique exhaust number on it, and states that the system is fully street legal.


*After a tuning this percentage might vary.

street-legal-exhaust-jekill-and-hyde

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jekillandhyde-research-and-development

dr. jekill & mr. hyde Research & Development 

They are the people who develop the Dr. Jekill & Mr. Hyde exhaust systems and make sure they are 100% legal: the R&D team. The research and development team designs, develops and tests the exhaust systems. From the moment a bike rolls in, they have the first look and start working from there. All have their specialities, whether it is the performance of the exhaust or the programming of our smartbox. Their collective effort creates the Dr. Jekill & Mr. Hyde as you know it.

 

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The perfect exhaust sound

what people say about us
User stories

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"The best sounding R1200 exhaust to date."
Derrick Creighton  |   BMW GS R1200

"Exquisite fit and finish, well laid out packaging and installation instructions. The adjustable exhaust sound level works flawlessly, and is very convenient to adjust to your mood and environment. The exhaust note is a nice mix of volume and bass tone. To me Exquisite fit and finish, well laid out packaging and installation instructions . The selectable exhaust noise level works flawlessly, and is very convenient to adjust to your mood and environment. The exhaust note is nice mix of volume and bass tone. To me the best sounding R1200 exhaust to date."

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"No comparison to the original sound."
Andrej  |   Harley-Davidson Sportster

"Just awesome, no comparison to the original sound. I would never go without a Jekill again."

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"The unique powerful sound I was looking for."
@dysnrider  |   Harley-Davidson Sportster

"Dr. Jekill & Mr. Hyde offers the unique powerful Harley sound I was looking for. Which is more bassy, but still civil enough for daily rides. Even the possibility of adjusting the valves with just a push of a button is very comfortable on longer tours. You get something for the price and it's worth it."

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"What a fantastic sound."  
Joost Westhof  |   Low Rider S

"What a fantastic sound is now coming from my Harley Davidson Low Rider S. I can't wait for the riding season to start again so I can test the system properly and enjoy the beautiful sound and performance."

 

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"It feels like I have 3 different exhausts."
JAAP - GS TROPHY TEAM NL  |   BMW GS

“Dust, mud, extreme weather ... I ride a BMW GS as it is meant to be! A motorcycle that breathes adventure must occasionally go off the paved road and offroad! “I used to drive with an exhaust that had only one mode, which means that there was only one sound. This was not really contributing to the driving experience. Driving with a closed valve on the paved road and opening the valve off-road really adds an extra dimension to the driving experience; it feels like I have 3 different exhausts! It is a great concept: if you show it to other people, you get a lot of positive feedback."

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"...this button that turns beauty into a beast!"
Peter Janczik  |   BMW GS

"The name really says it all: Dr. Jekill & Mr. Hyde! Apart from the great workmanship and the fantastic quality, it rounds off the entire look of my R1250GS Adventure TripleBlack perfectly. Then there is this button that turns beauty into a beast! What really impressed me is the possibility to be even quieter than a series with it. And every now and then there is this itch in the left thumb, with the subsequent grin on the face. "

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"Legal with perfect sound."
Sascha Koerner  |   Harley-Davidson Fat Boy

"Just WOW! I've had a motorcycle license since I was 18, but I've never bought a bike. My dream was to buy myself a Harley by the age of 40, but it didn't quite work out. But shortly before my 41st I did. The Dr. Jekill & Mr. Hyde system simply rounds it off, it is pure riding pleasure when you are out and about in Mr. Hyde mode. That's how a Harley has to breathe. Just yesterday, I rode to a gas station, and when I came out again, my bike was being inspected by another Harley rider. I just said, can I help? His answer: just wanted to see what you're riding, it sounds mega, I got to have it. I can just say thank you! Legal with perfect sound."

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"Thank you for this simply ingenious exhaust system."
André (@Bluebobber48)  |   Harley-Davidson Sportster

"I will never forget the moment when my 48 was brought home to me and I pressed the button for the first time. There was an incomparable, bassy sound, as it should be for a Harley. An absolute dream for every Harley rider. For me it is optically and technically by far the best system on the market and I would buy it again 100%. The look is perfect and the riding pleasure is absolutely unique. Thank you for this simply ingenious exhaust system."

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"An incredibly intense sound in open mode."
Dirk Zetzsche  |   BMW R18

"My Dr. Jekill & Mr. Hyde exhaust system is installed at BMW Munich. An incredibly intense sound in open mode and whisper-quiet when closed. And it looks good too."

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"An experience for my ears and soul!"
Andreas "Harley-Sportster-Lifestyle"  |   Harley-Davidson Sportster

"It's just awesome I can ride my bike to work at 5 a.m., without getting into trouble with the neighbors! But when I'm on the open road, press the button on the handlebars and the valve in the muffler opens, the show begins! The best sound you can imagine, bassy, muffled, every meter I ride becomes an experience for my ears and soul! Without worrying about a traffic control! I can only recommend: get a system, it is worth every penny."

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"Roaring sound and pure performance!"
Walter Wais  |   Harley-Davidson Sportster

"Dr. Jekill & Mr. Hyde is the best investment in my bike so far!!! It adds 100% more driving fun. I can adjust the volume according to my needs, and at the push of a button a roaring sound and pure performance. And the best of all it's street legal. Many thanks to the Dr. Jekill & Mr. Hyde Team - great job keep it up!"

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"Now my Bobber is complete."  
Julia Bystrzinski  |   Bobber

"Now my Bobber is complete. The sound is crisp & direct and the riding fun has another dimension now. Thanks that I could join the Jekill & Hyde family..."

 

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"A clear plus for safety!”
Werner - Berrt Travel  |   BMW GS

"Mr. Hyde position (valve open) is also ideal if I am quietly riding through traffic jams. The heavier sound is more noticeable and combined with a small speed difference it has a huge effect on the reaction of cars and trucks. A clear plus for safety!”

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"I can only recommend the Supreme."  
André  |   Chief

"The Supreme exhaust system from Dr. Jekill & Mr. Hyde gives my Indian Chief Dark Horse a unique bassy sound, as benifits an American cruiser! I can only recommend the Supreme to anyone who owns an Indian Chief."

 

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"I am very satisfied."
Olav Schnier  |   R18

"Coherent optics and robust, not intrusive sound, I am very satisfied."

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"Don't hesitate any longer and get a Dr. Jekill & Mr. Hyde exhaust!"  
Philipp  |   Street Bob

"Simply awesome!!! The unique sound makes every kilometre in the saddle a (sound) experience and hey, each of us only has 1 life, so I can only say to anyone who is still thinking: don't hesitate any longer and get a Dr. Jekill & Mr. Hyde exhaust immediately and you will enjoy every second on your bike even more, I promise!"

 

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"There's a night mode for those who come home late at night ;-)"
Martin Wyss  |   Breakout

"I've never regretted the decision to go with the Dr. Jekill & Mr. Hyde system and I look forward to every trip with the beautiful, deep and powerful sound. There's a night mode for those who come home late at night ;-) "

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"Dr. Jekill & Mr. Hyde makes the hair on the neck stand up."
Sportster Forty-Eight Icon  |   Harley-Davidson Sportster

"When I bought a Harley Davidson Sportster Forty-Eight, it quickly became clear to me that I had to replace the exhaust system. Of course, only one exhaust system was an option for me. The quality, optics and of course the sound of the Dr. Jekill & Mr. Hyde is simply unique on the market and all of this is still 100% legal. I would also like to highlight the great selection of end caps at this point, which allow each customer to customize. The change from the original system to the Dr. Jekill & Mr. Hyde exhaust system, transformed my Harley's sound from a lawnmower into a black beast. As soon as the infamous button is pressed, the hair on the neck stands up. Emotions and moments of happiness that Dr. Jekill & Mr. Hyde gives every motorcycle rider with their products. "

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"This is the exhaust I wish came stock!"
Terrance Cooley  |   Scout

"Completely changed the game for me. My previous exhaust had a nice tone but they were just too loud - I was setting off car alarms at idle. I wasn't enjoying riding anymore. When I heard the Dr. Jekill & Mr. Hyde exhaust though, I had to have it. The tones and volume were exactly what I was looking for, a button press away from inoffensive neighborhood bike to mean and proud cruiser with a tap. This is the exhaust I wish came stock!"

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"Nice sound."  
Luc Thielemans  |   Chief

"Nice sound and looks very nice on my new Indian Chief Dark Horse."

 

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"When so many beautiful things happen to you, that's worth 5 stars plus..."
Christian Sharkey Scherkenbach  |   Heritage

"When the sound hits you in the stomach, the ground trembles under your feet and a broad grin adorns your face, then for the first time you have pressed the button on your new Dr. Jekill & Mr Hyde exhaust system. When so many beautiful things happen to you, that's worth 5 stars plus..."

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"100% legal and yet the full Harley sound."
@strandfahrer  |   Harley-Davidson Street Bob

"So, What I particularly like about the Dr. Jekill & Mr. Hyde exhaust is the deep sound, the quality and that the valve is inside the silencer. I also think it's great that you can change the look of the exhaust afterwards by replacing the end caps. 100% legal and yet the full Harley sound is absolutely great, especially in Germany."

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"Give your BMW R18 the sound this bike deserves."
Motor Venray  |   BMW R18

"The Dr. Jekill & Mr. Hyde exhaust gives your BMW R18 the sound the bike deserves. Because of this glorified sound, you get the experience that one is looking for on a cruiser. Because the sound of the exhaust can be adjusted via the electronically controlled system, you can enjoy cruising anywhere and anytime with this characteristic motorcycle."

For those interested, the BMW R 18 can be seen and heard at Motor Venray with the exhaust from Dr. Jekill & Mr. Hyde."

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"Best exhaust system I have ever had on a bike!"
Terje Andre Mangseth  |   Bagger

"The deep rumbling sound and the estethics of the Dr. Jekill & Mr. Hyde exhausts is the «!» on this Indian beast, turning heads like no other! I am very pleased with both quality and performance, and my neighbours appreciate the gesture of silencing the roar of the engine with a touch of a button. No tuning needed what so ever, fully customized for my ride - it is simply awesome! Best exhaust system I have ever had on a bike!"

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"Legal and loud!"  
Dennis  |  

"Very very good sound, legal and loud. Neighbours are left alone and it screams out on the street."

 

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"Perfect finish and street legal."
Martin Brunner  |   Harley-Davidson Fat Boy

"Very good exhaust system - perfect finish and street legal. And Smartbox 2 is awesome!"

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"Choose your own style."
@marc_stone82  |   Harley-Davidson Sportster Forty-Eight

"If you are looking for a high quality and exactly finished exhaust system which can be modified to your own style you have to choose Dr. Jekill & Mr. Hyde! On top you also get the possibility to change your sound levels easily by a push of a button."

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"Every time I start my bike I get goosebumps."
Nick Vanhoof  |   Indian Scout

"I'm very satisfied with the exhaust! Every time I start my bike and let the deep bass sound rattle, I get goosebumps. It motivates my inner beast to get the best out of my Scout and enjoy the wonderfully pleasant and rough sound- only then I can fully enjoy a perfect motorcycle ride."

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"I can't get the grin off my face anymore!"
Stefan Senkfell  |   Harley-Davidson Fat Boy

"The best decision I've ever made to have this mega exhaust fitted! There is simply NOTHING BETTER !!! Should be standard on every Harley - I can't get the grin off my face anymore!"

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"Great quality, sound and instructions!"
Carsten Soejbjerg  |   FTR

"Love it, great sound when open, and great that you dont wake the neighbours in the morning (unless you want to:-) Great quality, sound and instructions!"

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'This sound impresses!'
Berti Schlottii  |   Indian Roadmaster

"In town, I use the quiet, Dr. Jekill mode. As soon as I leave the city I press the button and switch to dynamic mode, the middle position. I find this sound mode very comfortable. But if the situation asks for it, for example when drivers sticking too close to my license plate, the valve opens to the Mr. Hyde mode. And that sound impresses! With my wife on vacation, only dynamic mode is allowed. But if I am alone then..."

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"This is the best upgrade you can do on your bike."
Gerco Goote  |   Road King Special

" Today was my first ride on my Road King Special with the J&H exhaust. What a revelation. It felt like a brake had come off the bike and the sound is magnificent. This is the best upgrade you can do on your bike. My bike is Euro 5 and there it still works. The sound of the Mr. Hyde mode is warm and dark. The looks are also great. This exhaust is just what you need on your bike."

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"It was worth it."
Christopher  |  

"I am very satisfied. Great look, mega sound and still legal. It was worth it."

 

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"I feel like I'm the king of the streets."
@mawi_davidson  |   Harley-Davidson Sportster Forty-Eight

"When I ride with my motorcycle I feel free. And when I ride with my Dr. Jekill & Mr. Hyde exhaust I feel like I'm the king of the streets. And when everybody looks at me and give me a thumbs up I know I made the right decision choosing this exhaust system."

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"For me, no other system was ever considered."  
  |   Street Bob

"The perfect finish when it comes to design. For me, no other system was ever considered. EURO 5 and the push on the button lets us know why we ride Harley."

 

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"Goosebumps guaranteed!"
Christopher Falk  |   Sportster

"Incredibly beautiful sound! Goosebumps guaranteed, even when you start the second/third/fourth time!"

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"This is exactly what a Harley-Davidson should sound like!"
Alessandro Silverfox  |   Harley-Davidson Sportster Iron 1200

"From my point of view the best sound by far. This is exactly what a Harley-Davidson should sound like, nice and bassy. The Dr. Jekill & Mr. Hyde increases the driving pleasure by 100% and if you want to be a little gentler on the road, you always have the option to choose between the 3 levels. In addition, the quality and service are unbeatable, in my opinion the BEST system on the market. I don't want to be without them on any machine and would recommend them anytime."

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"I am a person with emotion - the sound of the motorcycle has to be top notch."
Frank Schelper  |   Harley-Davidson Breakout

"I've hesitated for a long time to buy a Dr. Jekill & Mr. Hyde exhaust system. This year I finally got the heart to configure and order the exhaust system according to my wishes. After the exhaust system was mounted on my Harley-Davidson Breakout and I picked up the machine, and I was fascinated by the sound after the first 5 km. I haven't regretted my decision since. It's also a wonderful feeling not to be out on the road with an illegal exhaust system anymore. I will continue to enjoy the sound in my ears every mile. This is another reason for me never to buy an electric motorcycle, athough I am convinced that electric motorcycles also have a certain charm. But unfortunately I am a person with emotion - the sound of the motorcycle has to be top notch."

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"A must-have on your bike!"
Thomas Peerlinck  |   Harley-Davidson Streetbob

"I have my Dr. Jekill & Mr. Hyde exhaust for one year now, 6.500 km on the 2019 Street Bob 107ci stage I with S&S teardrop intake... and VERY HAPPY! Amazing sound, deep, dark and loud, but quiet when necessary (neighbours, city center, horses or small kids around...) all this legal with certificate. This head-turing piece of art is a must-have on your bike!!"

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"Keeps the peace in my home."  
Jack Panitch  |   Street Bob

"This exhaust system is everything the manufacturer says it is. Keeps the peace in my home and neighborhood and gives the perfect sound."

 

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"Ride in stealth mode and not disturb anyone."
Jean - GS enthousiast  |   BMW GS

“I love to ride along the shores of Gérardmer Lake (Vosges, France). A beautiful place full of walkers, cyclists and sports enthusiasts. When I drive here I always use the Dr. Jekill mode, which gives me the possibility to ride in stealth mode and not disturb anyone. But when I make my way back on the meandering roads of Col de Bonnefontaine I switch to the Mr. Hyde mode to enjoy the delicious rumble that echoes through the mountains around me and at the same time warn oncoming traffic that I am approaching. Great right?”

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"Legal, but still a beautiful deep Harley sound."
Harley Dutchies  |   Harley-Davidson Sportster

"I got to know Dr. Jekill & Mr. Hyde at a motorcycle fair. I was impressed by this exhaust system from the first moment. But after a test drive I was sold. Wonderful to drive being able to play with the sound. The fact that it is legal, but still gives a beautiful deep Harley sound was the deciding factor in choosing Dr. Jekill & Mr. Hyde and they are also beautiful under my bike, also not unimportant. My bike passed the strict RDW inspection and I can confidently cross the (German) border without worrying. "

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"The sound is really perfect!"
Stefan S  |   Harley-Davidson Fat Bob

"I have installed my second J&H system, first on my HD Custom and since 2018 on my HD FatBob BJ 2018. What can I say, the sound is really perfect, not too loud, but also not too quiet, a bass tone, that fits the bike perfectly. I also looked and listened to other manufacturers, but then decided in favor of J&H. The advice and after sales service at J&H is great and I personally recommend all my biker friends to buy from you! The BEST! "

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"Real quality of workmanship"  
Thomas Eckl  |   Bonneville Bobber

" I have had your exhaust on my Triumph Bobber for about 4 weeks now, so I would like to tell you about my impressions. First of all, let's talk about the quality of workmanship. I myself am a quality engineer from the mobile industry and I have to give you a big thumbs up. The build quality is impeccable and there is really no reason to criticise it. Now for the sound, when you press the button and the flap opens, I immediately have a grin on my face, the sound is powerful and muffled, you can feel it on your chest and downhill when pushing the Bobber bubbles away wonderfully. I find the sound perfect, not too quiet and not annoyingly loud, just right! The half-open position is also very pleasant in terms of sound and perfect for a leisurely, more relaxed ride. I'm really pleased with this exhaust, it really makes a great bike out of the Bobber, both visually and sound-wise. It's very nice when people turn around to see what's coming. Thanks for this great exhaust!"

 

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"Perfect for off road rides or near residential areas."
Nikki van der Spek - GS Trophy participant 2020  |   BMW GS

"When you close the valve then the exhaust is quiet but sounds very smooth. Perfect for off road rides in nature or near residential areas. But when you open the valve and open the throttle, then the GS has a beautiful sound. Loud but not too loud, just perfect. It has a nice and dark sound."

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"The Exhaust gives you a real fighting mentality."
Xavier  |   BMW GS

“The Mr. Hyde mode allows me to communicate better with my motorcycle. Due to the different sound modes you get more feedback from your motorcycle, which helps, among other things, to signal when something is wrong with the motorcycle. For example when the tires have to be replaced. Mr. Hyde mode really wakes you up during a long drive or when I go off-road; it activates and motivates you. It gives you a real fighting mentality."

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