The Yamaha YZ450F GPR Full System Pentacross Titanium exhaust delivers enhanced performance and sound. This exhaust system improves power output by 2 horsepower. The full titanium construction reduces weight significantly. GPR's Italian engineering creates superior exhaust flow. The system installs directly onto stock mounting points without modifications. Maximum Power Gain: The full titanium system increases engine output by 2 horsepower through optimized exhaust flow Professional Racing Design: The Pentacross silencer design comes from extensive MXGP team development and testing Simple Installation: The exhaust mounts directly to factory locations with included flanges and brackets Premium Construction: Italian manufacturing ensures precise fitment and high-quality titanium welding Weig.