Check the listing for details. Lexx Slip On Silencer Exhaust Honda Trx 400X 400Ex 1999-2014 Muffler Pipe Gncc. Condition: New. Listed at 214.98 USD. Lexx Slip On Exhaust With MidpipeHonda TRX 400EX 1999–2008Honda TRX 400X 2009Honda TRX 400X 2012–2014-FITS Stock Header Only- Fully tunable exhaust system allows the user to change from a race exhaust (46mm Race Tip) to a forest friendly silencer (Quiet Core Insert) with just three bolts.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 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.Constructed of lightweight 6061 T6 aluminum and durable 304 stainless steel.