Gnarly 2-Stroke Pipe. 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. All pipes are electro-nickel plated for a non-chip finish that will not discolor. Nickel plating is an FMF trademark and has been 'copied' by everyone, making it the most imitated expansion chamber in the world. Gnarly gives maximum low-end boost. Super-strong 18-gauge steel construction makes it GNARLY! Note: Pipe may include factory indentations for proper installation clearance. Note: For closed course competition use ONLY. Not intended for street use.