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FMF Factory 4.1 Full Exhaust System

Item: 327283

$674.99 – $719.99

Select Your Vehicle - Fitment Guaranteed

  • Out of Stock

FMF Factory 4.1 Full Exhaust System


FMF's Factory 4.1 Full Exhaust System incorporates a full titanium MegaBomb header to extract exhaust gases as efficiently as possible. The entire exhaust systems helps to lower decibels without compromising power output. In addition, the muffler features a titanium sleeve with a stainless steel end cap to reduce mass as much as possible which in turn, helps to improve handling. The Factory 4.1 full titanium exhaust system is constructed from only aerospace grade materials that meet the California company's exacting specifications.

Each exhaust comes with FMF's proprietary Titanium MegaBomb header. The science behind the Titanium MegaBomb header actually reduces noise levels by as much as 1.5 dB when compared to conventionally-shaped headers to keep race and track officials happy. In addition, the headers are designed to produce more low end to mid range gains as well as broadening out the mid to top end power gains when compared to the stock exhaust layout.

  • Massive power gains throughout the RPM range
  • MegaBomb header for the ultimate in power output
  • Huge weight savings when compared to the stock exhaust
  • Fabricated using the highest quality proprietary blend of alloy grade materials
  • FMF RTS (Rapid Tuning System) makes for easy exhaust insert changes
  • Comes with all required mounting hardware and easy-to-follow installation instructions
  • FMF 94 dB quiet insert available (sold separately)
  • Made in the USA
Specification Details
Color Silver
Configuration Varies (make selection above)
Country of Origin USA
Finish Varies (make selection above)
Header PowerBomb
Header Construction Stainless Steel
Mid-Pipe Stainless Steel
Muffler End Cap Stainless Steel
Muffler Sleeve Titanium
USFS Approved Spark Arrestor 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.

Yamaha
  • Raptor 700 2013-2023
  • Raptor 700R 2006-2023
  • YFZ450 ATV 2004-2009, 2012-2013

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Questions & Answers

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Does the spark arrestor come out of the center on the 4.1? I know that it does on the Q4, but was wondering, since I'm getting this for my bike soon. Thanks in advance!!!

Yes, the Factory 4.1 muffler that comes with the full exhaust system has a removable spark arrestor. And, that arrestor is fixed with a single screw inside the end cap. One bolt, and out it goes. Pro tip: make sure you put some anti-size on that bolt before you install the exhaust on your bike. In this way, you can be assured an easy removal of the spark arrestor in the future! Otherwise, the heat, vibration and dissimilar metals tends to weld the bolt into muffler's end cap which makes for an interesting spark arrestor removal after only a few hours of riding!

By Staff
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