15" from mount to end header pipe for the Predator 6.5hp / 212cc, 196cc clone, Honda GX120, 160, 200, and Mid and Mini Trailmaster go karts. Stud spacing on header flange is 1.75" center to center. This pipe is a very easy and simple part to install and it allows your engine to flow air more efficiently which means more power. Washer end provides added safety and is AKRA legal. For best performance from this header pipe add the Predator Performance Air Filter Adapter Kit (KDPRED102AF) to your engine too.