Harley-Davidson® Softail®
Complete Your Softail
The Harley-Davidson Softail family covers everything from stripped-down cruisers to clubstyle performance builds and long-mile classics. Dr. Jekill & Mr. Hyde gives that platform the missing piece: premium adjustable sound built around your exact motorcycle.
Built For The Way A Softail Is Ridden
A Softail is not a background motorcycle. It has shape, stance, and presence before you ever press the starter. The exhaust should finish that look instead of feeling like an add-on.
Dr. Jekill & Mr. Hyde systems are built to give your Harley-Davidson Softail a deeper voice, premium finish, and three selectable sound modes. Keep it controlled when you need to be respectful, ride in Dynamic for everyday use, or open Mr. Hyde mode when you want the bike to feel fully awake.
Whether your build leans clubstyle, classic cruiser, stripped-down bobber, or long-mile comfort, the configurator helps match the system, finish, and options to your exact motorcycle.
What It Adds
1
Three Sound Modes
Choose Dr. Jekill, Dynamic, or Mr. Hyde mode so the sound matches the ride.
2
Softail Fitment
Built around the Softail platform with options based on your exact year, model, finish, and setup.
3
Premium Finish
Designed to look like it belongs on the bike, with finish and end cap options to match your build.
4
Real Control
One exhaust system gives you the ability to quiet it down or open it up without changing parts.
The Exhaust For Softail® Is Available For:
Low Rider® ST // Low Rider® S // Heritage // Street Bob® // Fat Bob® // Sport Glide® // Low Rider® // Hydra-Glide // Softail Slim® // Breakout® // Fat Boy® // Heritage Classic // Blackline® // Softail® Deluxe // Crossbones // Rocker // Deuce // Springer // Softail® Custom // Softail® Standard // Night Train // Bad Boy
The Valve
The Three Sound Modes
In Dr. Jekill mode, the valve closes to keep your Softail smooth, controlled, and easy to live with. It is the right setting for early starts, quiet neighborhoods, late arrivals, and any ride where you want the bike to stay respectful.
V-Strike Header Setup
Give Your Softail A More Aggressive Stance
Most Harley-Davidson Softail models before 2025 came with staggered headers from the factory. The V-Strike header setup completely changes that look by stacking the mufflers over each other and pulling the system tighter toward the motor.
Handlebar Sound Control
Change The Sound Without Changing The Ride
The Dr. Jekill & Mr. Hyde Modeswitch puts exhaust control right at your hand, letting you move between Dr. Jekill, Dynamic, and Mr. Hyde mode while keeping your eyes on the road.
Dr. Jekill Mode
A quieter, more refined sound for neighborhoods, early starts, late nights, longer rides, and respectful cruising.
Dynamic Mode
A balanced setting for everyday riding when you want more character without going fully open.
Mr. Hyde Mode
The open, aggressive sound mode for when you want your Harley-Davidson Softail to have a stronger voice.
Project 21 For Softail
Built For The Clubstyle Softail
The Twenty-One system brings Dr. Jekill & Mr. Hyde adjustable sound control into a clean 2-in-1 exhaust built for Harley-Davidson Softail riders who want performance attitude, premium finish, and everyday control.
Designed for riders who want more than a basic muffler swap, Project 21 gives your Softail a sharper clubstyle look while keeping the three sound modes Jekill & Hyde is known for. Ride refined in Dr. Jekill mode, balanced in Dynamic mode, or open it up in Mr. Hyde mode when you want the bike to have a stronger voice.
Why Jekill & Hyde
Four Reasons Your Softail Deserves A Jekill & Hyde
A Harley-Davidson Softail deserves more than a basic muffler swap. Dr. Jekill & Mr. Hyde gives you premium build quality, model-specific fitment, and electronic sound control in one exhaust system, so your bike can be quiet when it should be and fully awake when you want it to be.
1
Three Sound Modes
Ride in Dr. Jekill mode when you want it refined, Dynamic mode for everyday riding, or Mr. Hyde mode when you want the full sound of your Softail.
2
Built For Your Bike
Each system is made around the motorcycle, not forced onto it. That means cleaner fitment, better placement, and a finished look that belongs on your Softail.
3
Premium Quality
You are paying for more than a tube and baffle. Jekill & Hyde systems combine electronics, valve technology, premium materials, and serious engineering.
4
Real-World Control
Quiet it down for early starts, late nights, neighborhoods, passengers, and long rides. Open it up when you want your motorcycle to be heard.
Softail FAQ
Questions Before You Order?
Here are the most common questions about Dr. Jekill & Mr. Hyde exhaust systems for Harley-Davidson Softail models.
It depends on how your motorcycle is currently set up. Our exhaust systems are designed around the stock ECM parameters of the motorcycle and do 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.
Street legality can depend on where you live, where you ride, and which Softail configuration you choose.
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.
Slip-on systems usually take around 1-2 hours to install. V-Strike and Twenty-One full systems usually take around 2-3 hours. Actual installation time depends on the motorcycle, tools, and mechanical ability of the installer.
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. A Dr. Jekill & Mr. Hyde system is a complete electronically adjustable exhaust system with valve technology, rider-controlled sound modes, precision fitment, and premium components built specifically for your motorcycle.
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 Softail configuration.
