99 YZ400F Exhaust Suggestions

3 replies to this topic
  • twagner44

Posted January 16, 2012 - 02:21 PM


I just bought a 99 YZ400F last week and got to play with it in the desert for the past couple days. I absolutely love it! Thanks to those of you who pointed me in the right direction for starting techniques - didn't have a problem starting it all weekend. My next question has to do with the exhaust. The bike came with an FMF Ti4 pipe. All busted up and way too loud. As a quick fix I bought a quiet insert for it which helped a bit but it's still way too loud. Obnoxious to have that in your ear for hours on end.

What's a popular brand/model exhaust for these bikes? Is there any particular brand that matches up better than the others? It will need to be USFS approved for some of the riding I do...

  • RasmusDK

Posted January 16, 2012 - 04:39 PM


I got mine down to 90 db with stock muffler, I replaced the wool and put in two 1mm sheet metal plate shaped and placed like this inside the perforated pipe, I just spot welded them in..

Posted Image

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  • twagner44

Posted January 19, 2012 - 12:07 PM


There aren't too many options for pipes for that bike so I ended up ordering an FMF Q4 for it. Just got it in the mail last night so I'm anxious to put it on and try it out this weekend.

  • RasmusDK

Posted January 19, 2012 - 02:10 PM


Got an fmf for mine too, i only put it on once its way to loud for me, and i dont need the power i might give.

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