Thunderheader exhaust system for M8 Touring & Bagger – Chrome w/ heat shields

Our X-SERIES™ Exhaust is our newest line in creating maximum horsepower. With our 2″ head pipes, equal length tubes, and a larger collector, this exhaust is made specifically for Harley-Davidson’s Milwaukee-Eight™ engine. Includes full coverage heat shields. 18mm and 12mm O2 sensor ports.

Includes all heat shields, clamps, bracket, and install hardware. MUST use Screamin’ Eagle Flat Gaskets to install properly (HD Part#17048-98).

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.