Clear kick start Closely based on our YFZ450R exhaust Complete exhaust system made in premium stainless TIG welded Designed for modified engine Air Fuel tuning highly recommended Tubing step and size carefully designed for maximum power. Big 2.25'' core Available in shorty (12'') or regular (16'') silencer 98db range for the regular length. Silencer packed with high quality material and a special high temp core Dyno proven and track approved. Quality sticker sheet included.