FMF Factory 4.1 Full Exhaust System

Item Number: 327283


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Product Description

FMF Racing

FMF Factory 4.1 Full Exhaust System

The Factory 4.1 exhaust system is FMF Racing's premier performance exhaust system. Guaranteed horsepower gains throughout the RPM range and is the lightest Titanium system available. Used by professional race teams such as Factory KTM, Yamaha of Troy and Star Racing. Horsepower gains throughout RPM range. Megabomb header comes in Titanium.

  • Titanium canister shape and size is lighter and more performance-optimizing
  • Front and rear end cap designs developed to enhance fit, function and style
  • Fixed, specific mounting brackets for slip-ons and full systems
  • Excellent fit, finish and attention to detail

Spec Details
Configuration Single
Country of Origin USA
Header Varies (make selection above)
Header Construction Varies (make selection above)
Muffler End Cap Varies (make selection above)
Muffler Sleeve Varies (make selection above)

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping. Don't waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.


  • CRF150R 2007-2009, 2013-2014


  • YFZ450R 2009-2014
  • YFZ450X 2010-2011

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