The optional header provides increased tuning capabilities when used with the Slip-on Line titanium final.It's made of high-quality stainless steel, has a threaded lambda sensor for those planning to tune the engine's electronics, and has no catalytic converter.Power is increased by 1.5 horsepower at 7,650 rpm as measured on the Akrapovic dynamometer against a Honda CRF300L with a standard stock exhaust.It adds a distinctive deep and sporty sound. It features easy plug-and-play installation and no re-mapping is required.This exhaust is intended for track and closed-course racing use only.