The FMF Powerbomb header is the result of countless hours of research and development on and off the track seeking to maximize power from the exhaust system. The unique design of the FMF Powerbomb header provides room for the expansion of the exhaust gases creating a 10% increase in exhaust flow. Translation: more power. The larger "bomb" section of the FMF Powerbomb header creates more surface area to increase sound dissipation and lowering the dbs. By decreasing the sound level, your bike will more easily meet the tight sound restrictions. The FMF Powerbomb header is constructed out of durable Stainless Steel.