The Factory 4.1 system is FMF Racing's premier performance exhaust system. The 4.1 system comes with the choice of the Megabomb or Powerbomb header. Both systems guarantee horsepower gains throughout the RPM range and are the lightest titanium systems available.
-Used by professional race teams such as Factory KTM, Yamaha of Troy and Star Racing
-Horsepower gains throughout RPM range
-Powerbomb header available in stainless steel or titanium; megabomb comes in titanium only
-Muffler available in natural or blue anodized finish
-94dB Insert Included