Quieter exhaust for wr400???

4 replies to this topic
  • hane9272

Posted March 02, 2005 - 05:03 PM


I'm new here so please take it easy on me. I've got a 1999 wr400 with a FMF power core 4 exhaust and from the reading I get with the db meter device I'm a little to loud to race in the BJEC circuit. What are my options to get below 99db, I don't really want stock but if I have got to then so be it. What about the White Brothers "e" series?


  • firezwr426

Posted March 02, 2005 - 06:40 PM


fmf offers a quiet core insert for the PC4... I think it is around 35 or 40 bucks ...

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  • pjriss

Posted March 03, 2005 - 10:44 AM


I have a White Brothers e on my 426 and it's LOUD. I'll be putting on a Q and powerbomb header this weekend and I'll let ya'll know how they compare.

  • kirkw

Posted March 04, 2005 - 04:44 PM


i did a bit of research on this subject before I got my Q. Given the strictness that sounds is enforced with in my riding area, i called the rangers and asked what passed on WRs. Q 99% of the time, the others much less. the bike was uncorked stock when I got it. I got the Q before I got the powerbomb SX. With just the Q I noticed a little loss in power, mostly on top. It was MUCH quieter though. The powerbomb did make a little more power On the bottom, but not so much so that I would spend the funds on another if I had to replace it. Have passed sound, albeit right at the 96 limit, several times now.

  • 99wr400

Posted March 05, 2005 - 06:56 PM


tTry getting a powerbomb header, I heard that they reduce sound. SX for bottom end, MX for top end. :)


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