The Beast WithinThe Factory 4.1 system
The Factory 4.1
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The Factory 4.1

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The Factory 4.1 (4-Stroke Applications) is FMF Racing's premier performance exhaust. With 30 years of racing experience behind it, the Factory 4.1 takes advantage of everything we've learned on the race track.
* Available in natural or blue anodized finish.
* Horsepower gains throughout RPM range.
* Available with titanium or high strength stainless steel midpipe.
* 94dB Insert Included

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Today: 21 Jan, 2018