The FMF Factory 4.1 Carbon Titanium Exhaust System is the lightest complete system available.  FMF's Factory 4.1 system uses a carbon fiber shell combined with FMF's Megabomb or Powerbomb header assisting in horsepower gains throughout the RPM range. FMF says it is the world's best performing, lightest exhaust system for motocross and dirt bikes, has been race tested for proven reliability and top end performance. Featuring the best carbon fiber on the market for dirt bike and motocross racing, the Muffler is easily serviced for repacking and includes the quiet 94dB Insert.

Our wide selection of FMF mufflers will give you exactly what you're craving. If you're looking for the same exhaust system many of the top pro motocross riders and teams use or want to replace your stock muffler to gain some needed horsepower, we've got it. Some FMF Racing complete factory exhaust systems are available with powerbomb or megabomb header.