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quietest pipe for a wr 400.


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i have a 99 wr 400, it has an fmf q pipe. its not too loud but i was wondering if the stock pipe is quieter. id like to make the bike as quiet as possible. any info is appricated, thanks.

The stock pipe is probably the most quiet pipe you could put on it? Especially compared to anything aftermarket. This is just assumption though.

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Supposedly if you put a FMF header (Power bomb or mega bomb) they both will reduce noise by 1.5 decibels with the Q4 on it.

Re-jetting would be needed.

I have a Q4 muffler with a power bomb header and a JD jetting kit sitting in the box waiting for install :-)

And most, if not all aftermarket pipe suppliers, offer a "quiet" insert. If not, some other aftermarket suppliers may make an insert for it of their own.  You'll just have to research it.  I know Lexx has some really good quiet inserts for their stuff.  Don't know if Lexx makes pipes for WRs though.

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I have a 99 WR and I currently have a older FMF Power Core Q that has fresh packing in it. I don't know what the sound level is in db's . What was on the bike before was the stock pipe with a Vortip insert. The vortip is quieter mostly at idle and a little all the way through the RPM's. The reason I changed the pipe was to lose weight. The FMF is 3 pounds lighter. I recently decided to put it on a diet to see how much weight I could get off it without spending a ton of money. End up losing 14.5 pounds.

Edited by VinceDC
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I was thinking of mentioning the GTYR tip too. I made my own. Good flow gain. Not much more noise.

I have a KX450F and to be allowed to ride at a particularly good location I went through a lot of quiet muffler options and found that the current WR alum muffler is a bit heavy but excellent power vs sound. Some Yamaha sound engineer knows his stuff.

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