The FMF Racing Fatty pipe is the cornerstone of FMF's history. With over 35 years of racing experience behind it, the FMF Fatty is the industry benchmark. The Fatty broadens and smooths out the power curve while boosting gains throughout the entire power band, more low end, more mid, and increased over-rev. If you're riding tracks, trails, or in the open desert, the Fatty will offer what you're looking for.