Lexx Performance Exhaust Yamaha WR250F 2007-2013 Engineered to improve torque and acceleration with an increase of up to 4 horsepower on some machines. Lightweight design saves up to 3.5 lbs. over the stock exhaust. Included 46mm Race Tip for closed course competition. Includes USFA approved Quiet Core spark arrestor insert that brings sound levels down below 96db. Constructed of lightweight 6061 T6 aluminum and durable 304 stainless steel.