All new from the ground up, the FMF Powercore 2.1 silencer is built to provide excellent power for today's tracks. A smooth power curve throughout the RPM range keeps your 2-stroke motocross bike in the meat of the power! A large diameter canister is designed for more tenability and longer lasting packing life, so you can go longer in-between silencer service. Designed to compliment the performance of FMF Racing's 2-stroke pipes, the Powercore 2.1 Silencer is race ready out of the box! Choose the version that's right for your bike, the Aluminum version or the trick Titanium version.