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factory 4.1

  1. Factory 4.1 spark arrestor

    Engine/EFI/Drivetrain
    Well i just got my new heated grips & thumb throttle, gauntlets and FMF spark arrestor from Rocky Mountain ATV. Everything mounted up fine and worked great except for the spark arrestor which didn't fit the Factory 4.1 muffler at all. I ordered it because it says replacement for all Factory...
  2. New kfx 450r video

    General Discussion
    hey, I recently became a member to this website after purchasing a 2009 kfx 450r, I made a video of my fmf factory 4.1 silencer exhaust, its my first video and it would be cool if you could take a look at it. Thanks.
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