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.

Features:

• Titanium MegaBomb Header/Mid-Pipe
• Factory Forward Engineering centralizes mass and is less prone to crash damage
• Innovative rear endcap for simple installation of tuning tip inserts or spark arrestor
• Meets AMA & FIM sound requirements
• QuietCore 94db insert included
• Spark arrestor included in muffler
• Maintenance made easy with the removal of 4 screws on the front end cap