Item fits 2007 2008 2009 Yamaha YZ450 F WR450 F models.  Part# 044225 JC O/S The redesigned PowerBomb is a four-stroke header that incorporates FMF’s patented PowerBomb module at a precise location in the initial stage of the header. By positioning this “Bomb” at a key point in the system, increased performance and flow is achieved through the expansion and contraction of exhaust sonics through the system. Result is a flow increase of nearly 10%! The outer chamber in the Powerbomb allows the air to expand, cool and ramp back up at a higher velocity. Additionally, the PowerBomb is a “pre-muffler” of sorts which helps to lower the bikes sound output by providing more sound absorbing surface area for the sound medium (exhaust gases). On some models, you can choose between a moto or supercross version. The supercross version is designed for more low to mid-range power where the moto version is focused in the mid to upper RPM range. FMF pipes are computer designed and Dyno tested to make the power gains where each machine needs the most. FMF's Tru-Flo stamping process ensures a perfect fit and optimum performance. 18 and 19-gauge steel make their pipes stronger than stock. Some of FMF's performance designs are the most copied in the world! FMF pipes help put David Vuillemin in first place time and time again, they can help you as well.

We have a large  inventory our California location and multiple drop-ship warehouses across the US to help provide you the fastest delivery times. Your item is brand new, and will come to you in the factory packaging with all supplied instructions, decals, and any other materials included from the manufacturer. Your tracking number will be emailed*, and you will be provided with a Technical Support phone number should you have any questions after your purchase. If you have other questions regarding the exhaust pipes, air filters, tuning kits, installation or additional products in our ebay store ask the experts at parts@jcmotors.com or call (800) 706-9476. When calling or e-mailing, please have your phone number and auction ID number ready.