The Straightline Performance Yamaha Mountain Max 800 Lightweight Carbon Fiber Muffler combines a true carbon fiber canister with fully polished stainless steel internals, inlet, and outlet assemblies to create one of the lightest performance mufflers available. Designed as a direct bolt-on upgrade, it dramatically improves handling, throttle response, and overall mountain performance while delivering a deep performance exhaust tone. The muffler is fully rebuildable, allowing the internal packing to be serviced as needed depending on mileage and riding conditions, making it a true lifetime performance investment.