Lexx Performance Exhaust Honda TRX 400EX 1999-2008 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. Includes Forest Service approved Quiet Core Spark Arrestor Insert that brings sound levels down below 96db. Optional tuning exhaust tips and optional screen type Spark Arrestor are available to allow user to further tune power and sound characteristics. Limited lifetime warranty.