Dr. Jekill & Mr. Hyde® Exhaust for Harley-Davidson Breakout & Fat Boy (2018+)
This complete bolt-on kit includes everything needed for installation.
Includes:
- Exhaust System
- Electronically Adjustable Control Kit
- Mounting Hardware
The Dr. Jekill & Mr. Hyde® Exhaust for Harley-Davidson Breakout and Fat Boy models (2018+) is a street-legal, electronically adjustable exhaust system designed to deliver the perfect balance of sound, comfort, and rideability. Built specifically for Milwaukee-Eight cruiser models, it enhances the bold styling and powerful character of your bike.
With 3 selectable sound modes, you can tailor your exhaust sound to match every ride:
- Dr. Jekill Mode – quiet and smooth for cruising
- Dynamic Mode – deeper tone with more presence
- Mr. Hyde Mode – full, deep rumble
Designed to integrate seamlessly with the Breakout and Fat Boy, this system maintains the clean cruiser look while delivering a premium finish and fully adjustable sound—all with no tune required.
Fits Harley-Davidson models (2018–2026):
- Breakout
- Fat Boy
Features:
- Street-legal exhaust system
- Electronically adjustable exhaust
- 3 selectable sound modes
- No tune required
- Designed for Milwaukee-Eight cruiser models
- Premium design and finish
- Bolt-on installation
- OEM fit and compatibility
- 4-year guarantee
Customize your exhaust your way using our online exhaust configurator.
HD Touring // Soundcheck
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.
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.
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.
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.
Need Help?
Here we answer the most common questions about Dr. Jekill & Mr. Hyde® exhaust systems.
Why is this exhaust so expensive?
Why is this exhaust so expensive?
Because it’s not just an exhaust. Dr. Jekill & Mr. Hyde® combines precision engineering, premium materials, and advanced electronic valve technology into one system. Built in Europe and tested under extreme conditions, every component is designed for performance, durability, and control.
With the ability to switch between sound modes on the fly, you’re effectively getting multiple exhaust personalities in one system — something no standard exhaust can offer. This is engineering without compromise.
Do I need to tune with this exhaust?
Do I need to tune with this exhaust?
No. Dr. Jekill & Mr. Hyde® exhaust systems are engineered to work with your motorcycle’s factory settings, so no additional tuning is required on stock applications. The system is designed to deliver optimal performance and sound without the need for remapping. If your bike has been modified, we recommend consulting your local shop or reaching out to us for guidance.
Is it difficult to install this exhaust?
Is it difficult to install this exhaust?
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.
Where can I purchase a Jekill and Hyde exhaust?
Where can I purchase a Jekill and Hyde exhaust?
You can purchase a Dr. Jekill & Mr. Hyde® exhaust system directly from us or through one of our authorized dealers. Whenever possible, we prefer that you purchase through your local dealer to help support their business and keep their doors open. Use our dealer locator to find the closest authorized dealer near you. If you have a local dealer you prefer to work with and they are not currently a Jekill & Hyde dealer, contact us and we will work with them to arrange the sale through their shop.
