WR Muffler on a YZ?

11 replies to this topic
  • Dingus

Posted January 23, 2008 - 05:33 AM


My buying decision for a 2007 YZ450F hinges on the answer to this question:

Can the WR muffler bolt right on to the YZ? (2007 model)

I have acreage but I also need to be considerate of the neighbors and I don't mind the minimal loss of power with this "reverse" mod.


  • grayracer513

Posted January 23, 2008 - 06:14 AM


It should fit. Previous year models were interchangeable.

  • USED YZ426F

Posted January 23, 2008 - 06:54 AM


How much quieter is the WR muffler than the YZ?

  • grayracer513

Posted January 23, 2008 - 07:35 AM


A lot. A stock '07 is around 95-96 db (I believe), and a WR is at street legal levels, which would have to be closer to 86 db.

A current FMF Q comes in around 92 or less, which is not "that" loud, really, and would be a lot cheaper.

You might get a WR guy looking for inexpensive power to swap pipes with you.

  • USED YZ426F

Posted January 23, 2008 - 08:44 AM


Thanks Gray, I guess that I will check out eBay for a '00 WR 426 muffler and just repack it if necessary.

  • nickeenoo

Posted January 23, 2008 - 07:52 PM


I've got a full 07 WR exhaust I'll sell ya for the cost of shipping and a hamburger. From what I remember, the mufflers are not interchangeable but the full exhaust is. I might be wrong this is just what I remember from my research a few months ago.


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  • Terrain Rider 4z

Posted January 23, 2008 - 08:45 PM


I don't think the WR426 exhaust is much quieter than the YZ426 exhaust. The 07-08 WR pipes are the ones that are functional and super quiet.

  • USED YZ426F

Posted January 24, 2008 - 07:33 AM


But will an 07-08 WR exhaust be a direct bolt up for an '00 YZ 426?

It would be great if so, but I rather doubt it because the frames are completely different and would guess that the mounts would be completely different as well.

  • grayracer513

Posted January 24, 2008 - 07:57 AM


But will an 07-08 WR exhaust be a direct bolt up for an '00 YZ 426?

Nope, won't fit.

  • 234gearwheelie

Posted January 24, 2008 - 01:33 PM


I just fitted a wr250 03 silencer to my yzf450 03, i started it in my garage and it sounds like a giant sewing machine, very quiet and will pas MOT over here for road usage now. Gonna test ride it at track next weekend.

  • cowboyona426

Posted January 25, 2008 - 06:32 PM


I would not waste my time putting the heavy, corked up WR muffler on a YZ but to each his own. I would much rather spend the extra $ for a decent slip on.


Posted January 27, 2008 - 01:53 PM


im with cowboy

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