FMF 4.1 Full Exhaust Blue Carbon End Cap Chad Wienen Yamaha YFZ450R The FMF 4.1 Chad Wienen Full Exhaust for the Yamaha YFZ450R The chamber is designed to enhance and refine exhaust pressure. The exhaust is tuned with optimized core specifications and comes with the quality, craftsmanship and performance expected from FMF. Meets AMA and FIM sound requirements, Quiet Insert: 94dB Insert (included) Construction: Titanium, Midpipe: Stainless Steel, Endcap: Carbon Fiber