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.Nickel plating is an FMF trademark and has been ?copied? by everyone making it the most imitated expansion chamber in the world. Super strong 18 gauge steel construction makes it GNARLY. Includes O-rings. FMF Racing's Tru-Flo stamping process ensures a perfect fit and optimum performance
Incredibly durable nickel plating. Dyno and track tested for every application
Includes O-rings. The FMF Rev pipe focuses its power delivery in the middle and upper rpms of the powerband. If you are running out of power up top, want more time between shifts and do a lot of deep berm or sand riding, the FMF Rev is your pipe of choice.

Used by Yamaha of Troy, Team and Team Yamaha's David Vuillemin. Lighter 20 gauge steel used for the body of the pipe. 19 Gauge steel used for the header portion. Includes O-rings. Hand pounded seams for smooth flow transitions
Bolting on a Factory Fatty will enhance the powerband throughout the range. With increased horsepower and torque, you will not be sacrificing power to gain that factory look and feel. This is the same pipe many of the top supercross and motocross riders are using today. The SST pipe increases mid range pull and extends the over-rev considerably while sharpening the off idle throttle response. No other pipe on the market can offer these same type of gains or offer the same linear power delivery that the patented SST brings to the table.