FMF’s Factory 4.1 Silencer with Stainless Steel Mid Pipe is one of the best choices you can make when you want to keep your motorcycle or ATV running at peak performance. With the 4.1 you can expect to get a universal bump in performance that reaches across the entire rpm range. You’ll also get a hi-flo end cap that lets you tune the 4.1’s power with optional rev tubes and spark arrestors. The 4.1 isn’t just raw power though. FMF also prizes value and durability. It shows in the 4.1’s solid construction from excellent base materials and a precisely designed canister shape that maximizes internal packing volume to lower exhaust noise and extend service periods.
Tunable, spark arrestable silencer for your 4 stroke
Stamped with AMA approval for sound requirements
Aluminum canister body with stainless steel end cap and mid pipe
Easy bolt-on installation
Angle cut canister moves mass closer to center of machine
Hi-flo end cap accepts modular tuning inserts or spark arrestor