Back Speedmaster  exhaust

Modern technology wrapped in a classic design. Customize your Triumph Bonneville Speedmaster with Dr. Jekill & Mr. Hyde | The Exhaust.

CONFIGURE YOUR EXHAUST

TriumphBonneville Speedmaster

Cool, comfortable yet with a distinct style; the Speedmaster is a cruiser that is that is a joy to ride. Do not let the classic looks fool you... this bike has been carefully designed and engineered; resulting in superior handling and exquisite control. 

Now let's take it up a notch! Experience a sound like never before, when you push the button and hear the sound of Dr. Jekill & Mr. Hyde | The Exhaust. Because real gentlemen also have a rough edge.  

The Exhaust for Bonneville Speedmaster is available for:
Bonneville Speedmaster

 

Configure your exhaust

electronically adjustable exhaustAdjust your sound to the moment

The Jekill and Hyde Company gives motorcyclists the ultimate riding experience with The Exhaust. Our electronically adjustable exhaust system gives you the possibility to adjust your sound to the moment and offers street legality, excellent performance and premium quality.

Dr. Jekill & Mr. Hyde | The Exhaust offers a completely street legal, premium quality exhaust with 4 years warranty. Our exhaust system makes it possible to choose between three different sound modes on the fly, which makes every ride spectacular!

The Exhaust is a result of German engineering and Dutch craftsmanship. With state of the art technology, perfectly crafted by the best engineers in town. With computer simulations, the building of prototypes and extensive testing, we’ve created a tailor made exhaust for each and every bike. By riders, for riders.

Configure
the exhaust

Customize your own Dr. Jekill & Mr. Hyde | The Exhaust for Speedmaster. Let’s build something beautiful.

  • Dr. Jekill mode
  • Dynamic mode
  • Mr. Hyde mode

adjust your sound to the moment three sound modes

Dr. Jekill & Mr. Hyde systems embody three distinct personalities: the Dr. Jekill mode, the Dynamic mode and the Mr. Hyde mode. By a simple push of a button a valve inside the muffler closes, opens, or opens halfway, giving your exhaust more power and sound. This gives you all the tools to adjust your sound to the moment. Our software is programmed to intervene subtly and almost imperceptibly when the parameters set by the legislation are reached. This ensures that you are street legal in all riding modes.

 

More info

00:00 / 00:00

3 sound modes

switch

European type approval street legal

Dr. Jekill & Mr. Hyde | The Exhaust offers a completely street legal exhaust. It has a European type approval and thus complies with all European laws and regulations, as well as being CARB/EPA and TÜV tested. 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.

 

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You are Dr. Jekill & Mr. Hyde

live from
the road

We are happy that our customers love their Dr. Jekill and Mr. Hyde | The Exhaust. And they're proud to show it!

this is why
Riders love us

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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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"Thank you for this simply ingenious exhaust system."
AndrĂ© (@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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"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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"Ein unfassbar bissiger Sound im offenen Modus."
Dirk Zetzsche  |   BMW R18

" Meine Dr. Jekill & Mr. Hyde Auspuffanlage ist bei BMW München angebaut. Ein unfassbar bissiger Sound im offenen Modus und flüsterleise wenn geschlossen. Und gut aussehen tut sie auch noch."

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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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"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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"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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"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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"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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"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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"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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"Great sound. Totally worth the investment!"
KTM African Adventure  |   KTM 1090 Adventure

"Love my Dr. Jekill & Mr. Hyde! Street legal, more power and 3 great sound modes with a push of a button. And my bike is 1,5 kg lighter too. Totally worth the investment!"

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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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"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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"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 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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"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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"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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"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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"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 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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"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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"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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"...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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"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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"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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"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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"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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THE EXHAUST FOR Triumph Speedmaster

Customize your own Dr. Jekill & Mr. Hyde | The Exhaust for Triumph Bobber. Pick your brand, model, body colour, end cap and electronics, and make it yours. Let’s build something beautiful.

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