The FMF Gnarly pipe focuses on increasing the lower RPM horsepower and torque to get you out of the toughest terrain When looking to add 4-stroke tractor like torque to your 2-stroke and you need a pipe to withstand the harsh elements, this is the pipe for you Strong and rugged, this aggressive pipe dishes out handfuls of torque and bottom to mid range pull needed for the rigors of the off road domain Super strong 18 gauge steel construction O-Rings Included. EXHAUST GNARLY SHERCO