How it works

The ultimate riding experienceDr. Jekill & Mr. Hyde | The Exhaust

The Jekill and Hyde Company gives motorcyclists the ultimate riding experience with The Exhaust: an electronically adjustable exhaust system which makes it possible to choose between different sound modes on the fly. An exhaust second to none in regards to sound, esthetics and power.

Our exhaust 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. 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.

Dr. Jekill & Mr. Hyde | The Exhaust is a completely street legal system and complies with European legislation and laws, as well as being EC/ECE/EG/ABE/ EEC/EU/ECE/EGBE and TÜV tested. We care deeply about the environment, so all of our exhaust systems are built to achieve air quality standards.

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

The valve The three sound modes

Our exhaust 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 performance. You can choose per situation whether you want to ride in the Dr. Jekill mode, dynamic mode or Mr. Hyde mode. It’s up to you.

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Sound on!


parts & placing

The different electronic control units in our exhaust systems are the brains of our product.


Push it to control your exhaust system. Choose your riding mode. Looks and function may vary per country.


Smartbox/Blackbox/Control unit
Intelligent software unit that controls the servomotors.


These will react to the signal of the Smartbox and position the valve in the required mode.


The Exhaust
Reacting to the servomotors our patented valve system will be positioned in the required mode.


At the push of a button modeswitch

The electronically controlled and adjustable system allows riders to open and close the exhaust valve with the push of a button mounted on the handlebar. The button is fully weather-resistant and flickers a red light when activated for your convenience. 

Dr. Jekill & Mr. Hyde Smartbox

Electronics smartbox

The electronic control unit in our exhaust systems is the brain of our product. The Smartbox 2 is available for all motorcycle models equipped with canbus and is fully up to date in modern day technology. Thanks to its ability to read canbus signals coming from the motorcycle’s ECU, the Smartbox 2 makes sure you will not end up on the wrong side of the law no matter what mode you select. By committing the system to the parameters set by EU legislation, the Smartbox will seamlessly and subtly intervene if necessary. Depending on your model the Smartbox 2 will carry either Euro3 or Euro4 ready software.

electronics Blackbox

The Blackbox is our basic control unit and suitable for non-canbus models. The Blackbox offers 2 different sound modes: the Dr. Jekill and Mr. Hyde mode. Optionally the Blackbox can be equipped with a service switch that allows you to manually control the system. Please note: this switch is not street legal and should only be used for service, racing or demonstrational purposes.


electronics servomotors

By pressing the modeswitch, the Smartbox or Blackbox will send a signal to our servo motors. These will react and position the valve in the required mode. Thanks to a dual-cable operation the servo motors can switch back and forth between the open Performance and closed Travel mode, or engage the 50% opened Dynamic mode. The servo motors are equipped with heavy duty cables and a 100% waterproof seal to ensure strong and durable adjusters.

The Exhaust

When the valve is opened, the exhaust gases go straight through the exhaust, creating the deep rumble known from Mr. Hyde. When the valve is closed, the exhaust gases are diverted via the perforation to the side chambers of the exhaust, which are filled with damping. After passing through they are lead back into the exhaust and are released at the back, producing the quiet Dr. Jekill sound.

more info? request a brochure

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