FMF Gnarly Exhaust System # Designed to withstand total off-road abuse. # Tractable power is pushed down lower in the powerband # Made of tough 18 guage steel # Nickel plated for great looks and easy care Gnarly Power and tough construction makes the FMF Gnarly the strongest, best performing pipe off-road pipe for dirtbikes. But the real secret behind the brawn is the material. Thick 18 gauge US steel makes this one tough pipe. Built to last, this aggressive pipe dishes out handfuls of torque and bottom to mid range pull needed for late model 200cc through 500cc engines and the rigors of the off road or motocross. The FMF Gnarly is everything the name implies with performance gains well focused towards bottom and mid power with the goal being increased tractability. This makes the Gnarly an excellent off-road pipe and superb for tighter mx tracks.