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Our technical staff will out of the office returning on Monday. Orders and emails requiring technical support will be processed on Monday.

 
Average rating based on 2 review(s)

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I purchased a fmf q4 for my daughters bike and was very happy so I put one my 07 crf 450x and it fit perfectly.Performance gains were better than I expected with a nice increase in the low range and mid .Sound is quite a bit louder than stock but not offensive .Overall this product is excellent.

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Louder than stock. But, not as loud as by friends stock YZ450 and KX450F. Hard to say how much power it gave as I did a re-jet and airbox mod at the same time. Needless to say the bike RIPS NOW !!!!! I would recommend it.

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