FMF Power Bomb Header Pipe - Fits Aftermarket header pipe for your motorcycle or ATV. Increase in gas flow up to 10%. Lowers exhaust note up to 1.5 Dbs. Decreased weight vs. stock. Increased performance range. Modular exhaust port flange. Outer expansion chamber increases gas velocity. Increased throttle response. Perfect match with FMF silencers. NOTE: FMF does not guarantee the Power Bomb's fitment to stock mufflers.