Removed "Pea Shooter" From Exhaust, What Now?

6 replies to this topic
  • onlead

Posted May 19, 2008 - 11:28 AM


So my 2006 WR450F was purchased used with the "pea shooter" removed. I have read a lot of the threads discussing opening up the exhaust and keeping the bike quiet. I had a few questions that I couldn't quite get to the bottom of:

1) Is the stock exhaust running without the pea shooter equivalent to the after market mufflers as far as power is concerned. That is to ask if I am ok with the noise level is there still power left to be gained by using a YZ or aftermarket muffler?

2) Would adding the Pro Billet in the above setup lessen power and decrease noise.

Basically I'm trying to determine what is left to get out of the bike via the exhaust.

Thanks guys.

  • MountainMax

Posted May 19, 2008 - 12:07 PM


The stock exhaust is not as large diameter wize as a YZ one from the inlet back. I removed my pee shooter, and installed a PMB insert, a bit louder and more power, then i removed the inner baffle, now it's quite a bit louder but still acceptable and more power, then i removed it and put on a YZ muffler, and it's way louder and slightly more power. BTW I have the stock muffler with the mods including the PMB insert for sale if you want to buy it for the price of the insert and it's yours $55.00 plus shipping.

  • MountainMax

Posted May 19, 2008 - 12:08 PM


Oh, and there are way more mods you need to du, like cut the grey wire, put in a yz throttle stop and open up the intake, even go as far as a yz exhaust cam if you want more power.....

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • brad the best

Posted May 19, 2008 - 12:37 PM


or just cut the throttle stop screw with a hack saw .

  • onlead

Posted May 19, 2008 - 12:47 PM


I am planning on doing the other mods (airbox, greywire, etc).

So how much more power could I expect from say a FMF Q4 slip on versus the stock muffler with the pea shooter out, if any.

Thanks again!

  • Idaho450

Posted May 19, 2008 - 05:01 PM


I had the stock silencer with the GYTR tip and then went to the Q4. It's slightly louder with the Q4 but still quiet and has more power.

  • mikeythefokker

Posted May 19, 2008 - 09:09 PM


I did a full fmf factory 4.1 system, with the megabomb header, 4.1 titanium muffler, and 96db usfs tip, and of course jetted the bike to match it, and WoW! It changed the bike considerably. There is more power everywhere. I still blew under 94db at my last enduro too.


Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.