After months of development and testing, it is finally here. Introducing our all new PHX-24 model exhaust system for the YFZ450R. Our new design offers the awesome horsepower increase that DASA exhaust systems are known for but with an all-new updated design. This system has been endurance and durability tested by some of the best GNCC & AMA Motocross riders in the world. The PHX-24 is a multi-step, stainless steel exhaust system and includes a head pipe, mid pipe, and muffler. Features Include: Polished Stainless Steel Head & Mid Pipe Ceramic Coated Aluminum Muffler Housing (Black & Cobalt Only) Tig Welded - No Mig Welds Heat Resistant Foil Back Muffler Decal All-New Tapered Cone Inlet Design Tested By Some Of The Best GNCC & AMA Motocross Riders In The World Made in the U.S.A This exhaust system fits both the YFZ-R model and the YFZ-X model ATV