FMF Exhaust Fatty-Pipe - Yamaha Banshee 87-12FMF Exhaust Fatty Pipe Yamaha Banshee 87 12 With well over 35 years of racing experience behind it, the Fatty Gold Series pipe delivers race proven performance. The Fatty broadens and smoothes out the power curve while boosting gains throughout the entire power band, more low end, more mid, and increased over rev. No matter what type of riding you do, the Fatty has the benefits you're looking for. More tractable power, improved throttle control