FMF Power Bomb Header Pipe - Fits: Honda CRF450X 2005-2009 Aftermarket header pipe for your motorcycle or ATV. Increase in gas flow up to 10% and Lowers exhaust note up to 1.5 Dbs. Decreased weight vs. stock and Increased performance range. Modular exhaust port flange and Outer expansion chamber increases gas velocity Increased throttle response and Perfect match with FMF silencers.