NEW - Thunderheader exhaust system for FXR – Stainless Steel

****THIS IS FOR PRE-ORDER, NOT YET IN PRODUCTION***

Our new Thunderheader™ Stainless Steel design on the 1984-2000 Dyna Models features 1 3/4™ head pipes to our patented megaphone muffler design. Our stainless version features a two piece exhaust that attaches with a stainless steel clamp. This model includes 18mm and 12mm O2 Sensor ports.

Includes a transmission bracket, clamp, scotch bright pad, and all hardware to mount the exhaust.

****THIS IS FOR PRE-ORDER, NOT YET IN PRODUCTION***

Thunderheader exhaust systems are premium high-performance 2-into-1 exhausts designed to maximize horsepower, torque, and throttle response on Harley-Davidson motorcycles. Known for their race-proven design, Thunderheader exhausts deliver powerful low-end torque, strong mid-range acceleration, and consistent top-end performance.

Ideal for Harley-Davidson Touring models, M8 engines, baggers, Dyna, FXR, and Softail builds, Thunderheader exhaust systems are engineered for riders who demand real performance gains. Each exhaust features precision-welded construction, optimized collectors, and a distinct aggressive exhaust note trusted by racers and performance builders.

Whether you’re upgrading a street bike or building a performance-focused Harley, Thunderheader exhausts provide proven power, durability, and sound. Shop Thunderheader exhaust systems and take your Harley-Davidson performance to the next level.