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FMF Factory 4 with stock header

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Anyone here use an FMF factory 4 with the stock header?

I'm trying to find out from anyone who races how they felt about it?

I have one from my crf 250 and FMF will sell me a mid pipe that will let me use the pipe with my stock header.

I guess what i'm really asking is, did you lose a noticable amount of bottom end?

Did you gain a noticable amount of top end?

Thanks

Steve Landsberg

#211 OTHG & VET X

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with an aftermarket exhaust you really make all your power from the midpipe back to the muffler, the headpipe doesn't do as much as you would think. i race with a factory 4 sl on my yz250f and i felt as much of a power increase on mine than my friends 250f who has the entire system.

doug

'04 yz250f

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