Fmf Q4

6 replies to this topic
  • Idaho450

Posted March 17, 2008 - 07:05 PM


I'm looking at getting a Q4 for my '07 WR450 and running the stock header. I've already done the free mods and JD kit. Will I see a power difference over the stock muffler?


Posted March 18, 2008 - 02:18 PM


I have the the stock header with all the mods on my 2007 WR450. I put a Q4 on it and noticed a gain in power over the stock silencer. The stock silencer is really restrictive. I really like the Q4 because it made a noticable difference in power and you'll never have to worry about being over the decibel limit anywhere.

  • Idaho450

Posted March 18, 2008 - 04:53 PM


Does it sound much different from the stock muffler with a performance tip?


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  • Idaho450

Posted March 18, 2008 - 05:04 PM

#4 do you have yours jetted?

Thanks again,


Posted March 19, 2008 - 03:52 AM


The only performance tip I've heard is the GYTR tip. My bike with the Q4 is definetly more quiet than the GYTR tip. I run a 168 main jet at an altitude of 4000ft and less. Have you done the grey wire and throttle stop?

  • Idaho450

Posted March 19, 2008 - 05:28 PM


I've done the grey wire, throttle stop, AIS, etc... I put in the JD Kit also.

Do you happen to know which pilot you run?


Posted March 19, 2008 - 10:20 PM


...I'll have to ask my wife where the receipt is for it. I forgot to write it down. I'll check back when she get's off work tomorrow.


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