Dr. Jekill & Mr. Hyde® Exhaust for Triumph Bonneville T120 (2021–2024)
This complete bolt-on kit includes everything needed for installation.
Includes:
- Exhaust System
- Electronically Adjustable Control Kit
- Mounting Hardware
- Heat Shield
The Dr. Jekill & Mr. Hyde® Exhaust for the Triumph Bonneville T120 (2021–2024) is a street-legal, electronically adjustable exhaust system designed to deliver the perfect balance of sound, performance, and riding comfort. Built to complement the refined modern-classic design of the T120, it enhances both the look and the deep character of Triumph’s parallel twin engine.
With 3 selectable sound modes, you can tailor your exhaust sound to every ride:
- Dr. Jekill Mode – quiet and refined
- Dynamic Mode – deeper, balanced tone
- Mr. Hyde Mode – full, deep rumble
Designed for seamless integration, this system maintains the iconic Bonneville styling while adding advanced electronically adjustable sound control and premium performance.
Fits Triumph models (2021–2024):
- Bonneville T120
Features:
- Street-legal exhaust system
- Electronically adjustable exhaust
- 3 selectable sound modes
- No tune required
- Premium design and finish
- Bolt-on installation
- OEM fit and compatibility
- 4-year guarantee
Customize your exhaust your way using our online exhaust configurator.
Triumph T120 // Sound Check
USE YOUR HEADPHONES FOR THE ULTIMATE EXPERIENCE
LISTEN AND ENJOY THE THREE DIFFERENT SOUND MODES OF THE DR. JEKILL & MR. HYDE® - THE EXHAUST.
Mr Hyde
The exhaust boosts a beautiful, deep rumble.
Dynamic Mode
A tamed Mr. Hyde sound.
Dr Jekill
A calm, low-key but distinctive sound.
Technology
The Valve
At the heart of every Dr. Jekill & Mr. Hyde® exhaust system is the valve, the technology that makes The Exhaust truly unique. Electronically adjustable on the fly, it gives you full control over how your bike sounds, with three distinct modes that adapt to the moment. From a refined, more subtle tone with the valve closed, to a deeper, more aggressive character in Dynamic Mode, all the way to the full, uncompromising sound of Mr. Hyde with the valve wide open, you decide exactly how your bike performs and sounds every time you ride.
Innovation
Research & Development
At Dr. Jekill & Mr. Hyde®, innovation never stands still. Every exhaust system is born from intensive research, advanced engineering, and relentless testing under real-world and extreme conditions. Inside our state-of-the-art facility, we are constantly pushing our products harder, refining every detail, and improving every system to stay far ahead of the competition.
From sound control and valve technology to performance, durability, and long-term reliability, nothing is left to chance. Every part is tested, every system is challenged, and every improvement is driven by one goal: to build the most advanced exhaust system on the market.
Craftsmanship
Premium Quality
For over 30 years, Dr. Jekill & Mr. Hyde® has defined the standard in premium exhaust systems. German engineered and Dutch handcrafted, every system is built in Europe to deliver unmatched sound, aesthetics, and performance. Designed to withstand extreme heat, harsh conditions, and years of riding, each exhaust is rigorously tested and built using premium stainless steel and advanced Nomex packing for lasting durability. This is not your average exhaust system, this is craftsmanship without compromise.
Frequently Asked Questions
Do You Have Questions?
Here we answer the most common questions about Dr. Jekill & Mr. Hyde® exhaust systems.
Dr. Jekill & Mr. Hyde® systems are premium exhaust systems built around engineering, materials, fit, finish, and electronically adjustable sound control.
Each system is developed specifically for the motorcycle, designed as a precise fit, and built with advanced components like the electronically controlled valve system that gives you multiple sound modes at the push of a button.
You are not just buying a muffler. You are buying a complete premium system with advanced technology, model-specific development, and a 4 year warranty.
If your bike is completely stock, no tune is required.
Our exhaust systems are German engineered to perform properly in every sound mode and are developed around a stock motorcycle setup.
If your bike has aftermarket modifications such as a decatted header, cam, or high-flow air filter, we recommend contacting your local dealer or reaching out to us directly so we can advise you on the best setup.
No, not if you are installing our exhaust on a stock bike.
Our systems are designed as plug-and-play solutions for stock motorcycles and do not require a tune.
To take it a step further, in Europe we are an official partner of Harley-Davidson, and our exhaust systems are available exclusively through authorized Harley-Davidson dealers.
While the setup is a bit different here in the United States, that partnership reflects the strength of our relationship with Harley-Davidson and the level of trust our systems have earned at the corporate level.
No. Dr. Jekill & Mr. Hyde® exhaust systems are designed to be plug and play, with a precise fit for your motorcycle and no complicated modifications required on stock applications.
Installation is straightforward for any mechanically inclined person. If you are not mechanically inclined, please have the system installed by your dealer.
You can buy our exhaust systems directly through us, through our dealers, or at events.
If you want help choosing the right system or locating a dealer, our team can point you in the right direction.
