CVO 121 Exhaust System
Electronically adjustable exhaust for Harley-Davidson CVO 121 Street Glide and Road Glide
CVO 121 Exhaust System
$2,995.00
Harley-Davidson® CVO 121 Street Glide & Road Glide
Built For The CVO 121
The CVO 121 deserves an exhaust that respects the premium factory look while giving the Milwaukee-Eight 121 the sound and control it should have. This Dr. Jekill & Mr. Hyde system is built to match the chrome or scorched chrome finish, retain the original CVO end cap with a billet adapter, and deliver a louder, less restrictive U.S.-market sound with full electronic adjustability.
Keep The Look. Upgrade The Experience.
A CVO is not just another touring bike. It is Harley-Davidson's premium factory build, and every detail matters. That is why this system is designed to keep the CVO look intact instead of replacing it with a generic aftermarket style.
The billet adapter allows you to retain your original CVO end cap, so the exhaust continues to match the bike's factory design. Combined with chrome or scorched chrome finish options, the system gives you a clean factory-plus appearance.
At the same time, this system was developed with the U.S. rider in mind. It is louder and less restrictive than the European offering, while keeping the adjustability, technology, and premium build quality Dr. Jekill & Mr. Hyde has been known for for three decades.
What This System Adds
1
CVO End Cap Retention
A billet adapter allows you to retain the original CVO end cap and preserve the look you paid for.
2
Factory-Matched Finish
Chrome and scorched chrome options help the system match the factory CVO styling.
3
U.S.-Market Sound
Louder and less restrictive than the European offering, built for riders who want more presence from the 121.
4
Jekill Sound Control
Switch between Dr. Jekill, Dynamic, and Mr. Hyde modes for quiet comfort or a stronger touring sound.
Available For:
Harley-Davidson® CVO 121 Street Glide and Road Glide models. Built for riders who want to retain the CVO end cap and factory-style finish while adding Dr. Jekill & Mr. Hyde adjustable exhaust technology, premium construction, and a louder U.S.-market sound.
The Valve
The Three Sound Modes
In Dr. Jekill mode, the valve closes to keep your CVO 121 refined and controlled. It is the right setting for early starts, neighborhoods, long highway miles, and moments when you want the bike to stay comfortable without losing its premium character.
CVO End Cap Retention
Keep The End Cap You Paid For
The CVO 121 comes with a premium factory end cap, and replacing it with a generic aftermarket tip takes away from the look of the bike. Our system uses a machined billet aluminum adapter that allows you to retain the original CVO end cap while adding Dr. Jekill & Mr. Hyde adjustable exhaust technology.
1
Retains The CVO End Cap
Keep the factory CVO end cap instead of replacing it with a generic aftermarket exhaust tip.
2
Billet Aluminum Adapter
A machined billet adapter makes the factory end cap work with the Jekill & Hyde system.
3
1-To-1 Finish Match
Designed to match the CVO scorched chrome look so the system feels like it belongs on the bike.
4
Premium Jekill Technology
Keep the factory CVO style while adding three-mode electronic sound control and premium build quality.
Scorched Chrome Match
Built To Match The CVO Finish
The CVO 121 finish is one of the details that makes the bike special. Our scorched chrome option is designed as a 1-to-1 match, so the exhaust upgrade keeps the same premium factory appearance.
Instead of forcing your CVO into a generic aftermarket look, this system is built to blend with the motorcycle. The finish, billet adapter, and retained factory end cap work together so you get Dr. Jekill & Mr. Hyde adjustable exhaust technology without losing the CVO style you paid for.
Harley-Davidson CVO 121 Sound Control
Street Glide & Road Glide
Push The
Button
Push 1x For
Dr. Jekill Mode
Dr. Jekill Mode
Push 1x For
Mr. Hyde Mode
Mr. Hyde Mode
Push 2x For
Dynamic Mode
Dynamic Mode
In-Stock CVO 121 Exhaust
Choose Your CVO 121 System
Installation Support
CVO 121 Installation Video
Review the Dr. Jekill & Mr. Hyde installation video before fitting your Harley-Davidson CVO 121 exhaust system.
A CVO motorcycle is not shown in this video, but the CVO 121 system installs the same way. Wiring routing, component placement, and the installation flow are identical.
View Installation VideosWhy Sound Control Matters
Built For Long Miles, Big Sound, And Full Control
A CVO 121 Street Glide or Road Glide is built for premium touring, strong Milwaukee-Eight power, and a factory look worth preserving. The Dr. Jekill & Mr. Hyde system gives you the sound to match the bike, without forcing you to live with full exhaust volume every mile of the ride.
1
Long-Distance Comfort
Keep the sound refined on long highway stretches so the exhaust does not become tiring during big-mile touring days.
2
Passenger Comfort
Your passenger sits directly in the sound path, so adjustable volume helps make two-up riding more comfortable.
3
Quiet Places
Turn it down when leaving early, coming home late, checking into hotels, or rolling through quiet neighborhoods.
4
Open It Up
Switch to Mr. Hyde mode when you want the CVO 121 to have the deeper, stronger presence it deserves.
CVO 121 FAQ
Questions Before You Order?
Here are the most common questions about the Dr. Jekill & Mr. Hyde exhaust for the Harley-Davidson CVO 121 Street Glide and Road Glide.
It depends on how your motorcycle is currently set up. Our exhaust system is designed around the stock ECM parameters of the motorcycle and does not require a tune when installed on a stock bike.
If you currently have additional performance products installed, such as engine work, intake changes, or other performance upgrades, we recommend asking your motorcycle mechanic or shop. You can also contact us and we will help point you in the right direction.
Yes. You can change the valve position and ride in any sound mode at any point in time.
Switch between Dr. Jekill, Dynamic, and Mr. Hyde mode from the rider control, giving you quiet control when you need it and a stronger exhaust note when you want it.
This system includes a catalytic converter and is designed around the stock ECM parameters of the motorcycle.
Street legality can depend on where you live and ride, so please check your local laws and requirements. If you have any questions, contact us before ordering and we can help point you in the right direction.
Please refer to the installation video online or the supplied paper instructions that come in the kit.
For a competent mechanic, installation is usually around 1 hour. Installation time can vary depending on tools, experience, and the condition of the motorcycle.
You are paying for extensive research and development, premium build quality, model-specific engineering, and the adjustability Dr. Jekill & Mr. Hyde is known for.
This is much more than a tube and baffle. The CVO 121 system is a complete electronically adjustable exhaust system with valve technology, rider-controlled sound modes, precision fitment, and premium components built specifically for the Harley-Davidson CVO 121.
There is no other motorcycle exhaust company that compares to Dr. Jekill & Mr. Hyde when it comes to combining sound control, engineering, craftsmanship, and everyday rideability in one system.
Everything needed for installation, except for tools and time, comes inside the box.
The system includes the required exhaust components, electronic valve technology, rider control components, and hardware for the selected configuration.
