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This Powerbomb Header is a one-piece header pipe manufactured by FMF Racing. This four-stroke header is built from high-strength stainless steel. It features FMF's patented technology to provide an increased performance of up to 10% horsepower gain. The ducted core allows the exhaust gases to exit into the bomb chamber, expand, cool and ramp back up at a higher velocity. FMF Powerbomb header also acts as a pre-muffler to lower the dirt bike's sound output by as much as 1.5dB by providing more sound absorbing surface area for the sound medium.