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Exhaust For Big Cubic Inch Motors w/Heat Shields – Chrome $ 1,899.00 – $ 2,548.00 Dealers Only This product has multiple variants. The options may be chosen on the product page

Thunderheader head pipes are tuned to the proper length and diameter to produce maximum horsepower and an excellent torque curve. With a patented collector design, only Thunderheader systems can produce their power, torque and sound.

Thunderheader head pipes are tuned to the proper length and diameter to produce maximum horsepower and an excellent torque curve. With a patented collector design, only Thunderheader systems can produce their power, torque, and sound.

Introducing the Thunderheader 2 into 1 High Performance Exhaust System - 1039, the ultimate exhaust upgrade for your motorcycle. With its cutting-edge design and advanced features, this exhaust system is designed to deliver maximum horsepower and …

Our X-SERIES™ Exhaust is our newest line in creating maximum horsepower. With our 2″ headpipe, 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 …

The Thunderheader 2 into 1 exhaust system features a patented collector design that allows spent exhaust gasses to flow in a spiral motion through four acoustical dampening chambers. Exhaust gases flow through these chambers at high velocity and scavenge the spent exhaust from the combustion chamber bringing in a fresh charge of air/fuel mixture.

Shop the best selection of Thunderheader exhaust systems at Dennis Kirk for the lowest guaranteed prices. Same Day Shipping!

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

2-into-1 systems with patented collector design that directs spent exhaust gases in a spiral motion through four acoustical damping chambers; Exhaust travels through these chambers at high velocity to scavenge spent exhaust gases from the combustion chamber and bring in a fresh charge of air/fuel mixture