Check the listing for details. FMF Power Bomb Header Pipe Exhaust Fits HONDA CRF450R 2004-2008 CRF450X. Condition: New. Listed at 253.29 USD. FMF Power Bomb Header Pipe Exhaust HONDA CRF450R 2004-2008 CRF450X 2005-2017 The FMF Power Bomb Header Pipe is always a solid choice when you want great sound, extra power, and straightforward performance added to your dirt bike or ATV. The stainless steel construction of the Power Bomb makes a pretty package. But the center of focus is the "Bomb" module precisely located on the header, giving you up to 10% better exhaust gas flow. The Power Bomb uses its dual chamber design to circulate gas through an external chamber where it expands and contracts before exiting the header at an increased velocity. This increased flow will give you a snappier throttle response and a noticeable bump in performance. The external chamber also acts as a type of "pre-muffler" that lowers the exhaust note up to 1.5 decibels for a deeper, throatier sound. The FMF Power Bomb easily bolts on in place of your stock header and is a perfect pair with FMF silencers to create a complete package. Specs: 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 Special Notes:FMF does not recommend or guarantee you can match it to a OE stock muffler. Fits the following models: HONDA CRF450R 2004-2008 HONDA CRF450X 2005-2009 HONDA CRF450X 2012-2017