Stripped Back, Turned Up
Electronically Adjustable Exhaust Systems For Triumph Bonneville Bobber
The Bobber is the most stripped down bike Triumph builds, a single seat, a hardtail silhouette, and a torque heavy twelve hundred sitting right out in the open. Dr. Jekill & Mr. Hyde builds an electronically adjustable exhaust for it with three selectable sound modes controlled from the handlebar, available in street-legal configurations where applicable. That system is the King.
One exhaust, three personalities. In Dr. Jekill mode the valve stays closed for a restrained note, right for early starts and quiet streets. Dynamic mode opens it halfway and the low end thickens up. Mr. Hyde mode opens it fully and the Bobber gets the deep, heavy voice its stance has always promised. You choose per situation, at the press of a button.
On a bike this exposed, the exhaust is not hidden behind bodywork, it is part of the profile. The King is developed for the Bonneville Bobber specifically, built around its own lines and mounting points, the result of German engineering and Dutch craftsmanship. It should look like Triumph could have fitted it themselves.
Dr. Jekill & Mr. Hyde electronic valve technology lets you adjust the sound on the fly. One premium exhaust system, three distinct personalities, full control from the handlebar. Backed by a 4 year warranty.
2017 And Newer: The King
Bonneville Bobber
The Valve
The Three Sound Modes
In Dr. Jekill mode the valve stays shut and the Bobber keeps quiet. Cold starts before sunrise, side streets, the ride home late, all of it handled without waking anyone up. The look still turns heads. The sound does not have to.
The King
Built For The Bobber
The Bobber trades on heritage and gets away with it because the execution is right. Hardtail lines, a single sprung seat, and no bodywork to hide behind. It is a bike people stop and look at, which makes the exhaust part of the design rather than a component bolted underneath it.
The electronic valve gives it the range the styling asks for. Dr. Jekill mode closes it down and keeps things civil. Dynamic mode opens it halfway and the low end thickens. Mr. Hyde mode opens it fully and the twelve hundred finally sounds the way the bike looks. All three from a button on the handlebar, changed on the move, without stopping.
Premium materials throughout, a finish built to take weather and heat year after year, and a 4 year unlimited mileage warranty behind it. Available in street-legal configurations where applicable, and on supported stock setups no fuel tuner or ECU flash is required.
Available For, 2017 And Newer
Bonneville Bobber // Bonneville Bobber Black
Sound Check
Hear All Three Sound Modes
Headphones or a good speaker recommended.
- Dr. Jekill Valve closed. Calm and low key, quiet enough for an early start or a slow roll through town.
- Dynamic Valve half open. The bottom end fills in and you get real weight behind the throttle, without shouting about it.
- Mr. Hyde Valve wide open. Deep, heavy, and unmistakable off idle, the sound the Bobber's stance has always promised.
The King Exhaust System is available on the in stock product page.
View In Stock ProductIn Stock Now
Build It Your Way
What you see here is what we hold on the shelf, ready to ship today. It is one of several ways the King can be built.
The full range of options is available to order. Choose your model, your finish, and your end cap, then see the whole system come together before you buy.
Configure Your ExhaustWhy Sound Control Matters
All The Sound You Want, Only When You Want It
A loud exhaust is great right up until it is not. Dr. Jekill & Mr. Hyde gives the Bobber the deep, heavy voice its stance deserves when you want it, and a quiet one when you do not, and lets you move between them from the handlebar without stopping.
1
Keep The Peace
Fire it up at dawn or shut it down late without the whole street learning your schedule.
2
Arrive Without Announcing It
A bike this striking already draws a crowd. Sometimes you would rather it be the look doing the work.
3
Match The Moment
Bike night, a slow roll through town, a quiet lot at the end of a ride. Every one of them asks for something different.
4
Then Let It Out
Open road, empty lane, one press of the button, and the twin finally sounds the way the bike looks.
Triumph Bonneville Bobber FAQ
Still Have Questions?
The answers riders ask most often about Dr. Jekill & Mr. Hyde adjustable exhaust systems for the Triumph Bonneville Bobber.
The King is built for the Triumph Bonneville Bobber and the Bonneville Bobber Black, 2017 and newer. It is developed for those motorcycles specifically rather than adapted from another model in the range.
Confirm your exact year and model in the configurator before ordering. Not certain which one you have? Send us a message and we will confirm it with you.
On supported stock configurations, no tune, fuel tuner, or ECU flash is required. The system is developed around the factory setup of the motorcycle.
Already running other performance parts, like an intake or a fueling mod? Check with your mechanic or shop first, or reach out to us and we will help steer you the right way.
Absolutely. The valve position can be changed at any moment, and you can ride in whichever sound mode you like.
Move between Dr. Jekill, Dynamic, and Mr. Hyde straight from the handlebar control, keeping things quiet when you need to and opening up the note whenever you want to.
Our Bobber systems are electronically adjustable exhausts available in street-legal configurations where applicable and engineered to work with the motorcycle's stock setup.
Local rules on street legality vary by where you live and ride, so it is worth checking the requirements in your area. Not sure? Get in touch before you order and we will help point you the right way.
Every system is fully plug and play. No cutting wires, no splicing. Printed instructions ship in every box, and our install videos are online whenever you want to watch ahead.
For a capable mechanic it is a straightforward job. The exact time depends on your tools, your experience, and the condition of the bike.
Dr. Jekill & Mr. Hyde® systems are premium exhausts, built on serious engineering, quality materials, exact fitment, clean finishes, and electronically adjustable sound control.
Every system is developed for one specific motorcycle and built with advanced parts, including an electronically controlled valve that delivers multiple sound modes at the press of a button.
That control is the thing a permanently loud pipe can never give you. Slip quietly through neighborhoods and noise sensitive areas, sidestep a costly citation, and stay on good terms with the people you live next to. Then the road opens up, you press the button, and the tone comes with it.
This is more than a muffler. You are buying premium engineering, advanced technology, model specific development, real everyday flexibility, and a 4 year warranty.
