FMF "Q" Exhaust??

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Jul 14, 2000
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#1
Has anyone tried the new FMF Q exhaust on a YZ426, or any other bike? They claim it reduces the sound to 94 db with no reduction in power.:eek: Is this claim factual?
 

EK

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Dec 3, 2000
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#2
After getting taken on a "quiet core" for the WR400F I had, I am skeptical of such claims.

Check out the write-up in the current Dirt Rider. They say it is quiet without losing horsepower. It sounds good.

Eric K
'01 GasGas 300XC
 
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#3
Really Quiet

I bought one for my 01 426. It is very quiet, no noticeable loss or gain in power..you hear the motor a lot more than with the stock exhaust. I took my Q exhaust off to ride wherever Idont need a sparkarrestor because the bike just sounds better. I wasn't impressed with the silencer for the price, $330. Really not an impressive part. But it did do the job of quieting it down.
 
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#4
Re: Really Expensive, Large and Chrome

I have had a Q on my ’01 YZ 426 for about a two months now. It did seem to richen things up a bit. It is definitely quieter, no question about that, this is especially noticeable at lower RPMs but it is probably more pronounced with the throttle open.

I have tried the stock can and the Q back to back on one occasion. I think the Q does steel some power down low, but it really shines up top. IMO it revs just like the stocker, maybe even a tiny bit better. I wouldn’t be surprised at all to discover the peak HP is the same on a dyno.

But I do think it robs a small, but noticeable, amount of low end.

I paid $290 for mine, but that is still too much. A two-stroke pipe seems more complicated to build, and is much cheaper. I recently had an entire exhaust, from the catalytic converter back, installed on my truck for less than what I paid for this pipe. I just don’t understand the pricing on these 4 stroke exhausts....

If I didn’t need a SA I would have just left well enough alone. But I am happy so far with the Q, and given the relative price of other systems would say it is worth the extra twenty (forty??) bucks.

Finally, I have heard of problems sealing with the header, but this seemed to occur on 400s only. I think the 426 header may be larger, because mine fits very snug and does not leak at all despite what must be more back pressure than stock.
 
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#5
As big as a KTM can

I just wanted to add that I had a PC T4 on my ’00, and it robbed the top to pay the mid. I liked this at the time, but after riding my ’01 stock for a bit I found myself loving the rev that I sacrificed with the PC. The FMF Q loves to rev too.

If you like to short shift you may not like the Q at first. If you like to spin it a bit longer in each gear then you will be happy.

But to answer your question Tex, I don’t know for a fact that overall power isn’t reduced but it wouldn’t surprise me if this WAS true. I guess that is a bonus because, personally, I did not believe it when I bought it, I just wanted to try something a little quieter for a change.

Hope this helps.
 
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#6
? to Hick

Hick,

On my 01 YZ426, there was not enough room for thre gasket between the header and silencer, so i went with out it and had a snug fit with no noticeable leaks. Were you able to use that gasket or did you just run without it?

Thanks
 
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#7
No Gasket

I run it without any gasket. On a tip I picked up somewhere, maybe here, I did make a few wraps with some teflon tape at the end of the header.

No leaks.