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  1. Engine/EFI/Drivetrain
    Alright, I just down sized from a 450r to a 400ex and im looking for more power! I mostly trail ride and just screw around with friends drag racing, jumping etc. Current aftermarket parts -K&N with outerwears -FMF powercore slip on -14t front sprocket - loving this for wheelies I was...
  2. Engine/EFI/Drivetrain
    I am getting a slip on exhaust for my 400ex and i am debating between the FMF powercore4 or the FMF Q4. Do you guys think its worth an extra thirty dollars to get the Q4? I also saw the Big Gun eco system but I dont want a poorly built exhaust.
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