FMF factory 4.1

2 replies to this topic
  • Davos

Posted May 28, 2008 - 11:34 AM


I am looking for a slip on for the 08 yz450f. I need a spark arrestor so ill get a less restrictive pipe and a spark arrestor all in one.

its come down to

white brothers E2

FMF Factory 4.1

i just want to know if people like the FMF, I already love the white brothers, but the look of the fmf is nice, anyone have any videos with it on your bike?

Thanks, Dave

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  • KJ790

Posted May 28, 2008 - 05:22 PM


I love the factory 4.1 silencer. The only problem is that you have to buy the spark arrester separately. On the 08, really any silencer is better than the stock one.

  • frankllynn

Posted May 28, 2008 - 05:27 PM


My friend got the fmf for his wr250 and it really made a nice low mid gain.

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