M8 2017-2026 Custom Factory Exhaust Head Pipe - Modified head pipe: Angry 2 into 1 merge collector, 2.25" to 2.5" stepped Core to factory cross pipe outlet, stock O2 Sensor Bungs, or optional wide-band O2 sensor bosses (M18) (contact us for wide-band options)
Our Angry Head-pipe is the proper way to utilize the already excellent Harley-Davidson Head pipe. We weld in a new 304 stainless oval to 2.25" stepped up to 2.5" collector pipe (where the cat box was) while optimizing the factory collector "D"-shaped head pipes. These head pipes have been dyno-tested and are currently being re-tested this fall 2026, we have had excellent results and we expect to improve with the new stepped collector. The sound mimics the older-school sound and performance of a 2-into-1 head pipe while reducing the sound and heat level on the right side of the motorcycle by keeping the factory cross pipe. Approximate gains of 10 HP and 10 ft lbs of torque on a stage 4 128 SE (see Dyno chart here) using the factory SE tuner and custom tuning. Expect more or less depending on your modifications. This head pipe also utilizes your stock heat shields. Price includes pick-up and return shipping from and to you. New Dyno chart is in the works ! Allow 1-4 weeks for delivery - call or contact us to inquire at time of order - we could we welding some right now!
these pipes are intended for off road use & track use only unless accompanied by cat-in mufflers
