$999.00
Unleash unparalleled power and sound with the Concentric Mainshock Exhaust. Designed for the audacious rider, its dual 3” conical outlets are engineered to produce a deep, thunderous rumble that resonates with the spirit of adventure. Perfect for Harley Davidson’s Twin Cam and M8 engines, this exhaust is not just an upgrade—it's a statement. Embrace the raw, rugged essence of the...
Tags: 2 in 1 Exhausts for Dyna , 2 in 1 Exhausts for Harley-Davidson Touring , 2 in 1 Exhausts for Softail , Exhaust Systems for Fat Bob & Low Rider
Unleash unparalleled power and sound with the Concentric Mainshock Exhaust. Designed for the audacious rider, its dual 3” conical outlets are engineered to produce a deep, thunderous rumble that resonates with the spirit of adventure. Perfect for Harley Davidson’s Twin Cam and M8 engines, this exhaust is not just an upgrade—it's a statement.
Embrace the raw, rugged essence of the road with an exhaust that mirrors your bike's indomitable spirit. The Mainshock's raw metal aesthetic, reminiscent of a shotgun exhaust, is the epitome of untamed power. Its visual appeal is matched only by its sonic presence, ensuring you capture attention whether cruising highways or navigating city streets.
Distinctive Features:
*Exhaust system consists of 2 head pipes
*O2 Sensor bungs are located about 4"-6" from exhaust port.
*Floorboard spacer might be needed.
* For some Dyna models it is possible that the oil dipstick is covered.
**Customizations can be made to the original design but might cause additional charges which will be discussed before the order is delivered.
We offer three distinct finishes:
Heat shields are custom-made for each system and match the finish of your exhaust. They’re designed to blend seamlessly and preserve the overall look of the pipes.
Each order comes with:
No additional mounting hardware is needed—our systems bolt directly to the engine. If required, custom brackets can be fabricated upon request.
We perform a mock-up and test fitment on a bike similar to yours during production. This ensures your system has no clearance issues and will install properly when it arrives.
Yes, a tune is recommended to optimize performance and ensure your bike runs smoothly with the new exhaust.
Yes, we include O2 sensor bungs located about 3–6 inches from the exhaust port. We offer:
If you're unsure, we can include both thread sizes to ensure compatibility.
You can place an order online, or by calling us at 866-4-GALLOP.