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Discussion Starter #1
Well I had ordered the R2 tip for my exhaust and I was not impressed. After installing I took it for a ride and I noticed that it seemed to have a bit more power, but on the down side it has alot of popping and back firing on decel. I then spoke with a guy that was on a Grizzly and he and I got to talking and he showed me how he had modified his exhaust. It was an earlier Grizzly (unsure of the year) as it only had 3 bolts on the exhaust tip that he had made. He stated that he did not have any issues with it and doesn't run a fuel tuner. So I took the idea and ran with it. I removed my exhaust tip and measured the outside diameter which was about 4 inches. So with that I cut out a 4 inch circle out of a 1/8 inch piece of metal with a hole saw, then I started out by drilling the center out to 7/8inch which is the stock exhaust and then drilled the 4 mounting bolt holes 1/4 inch, then welded on a 4 inch long 7/8inch pipe with a slight down ward slope. Ran better then the stock exhaust, and no popping or back firing. So with that I set out to find out how big of a pipe I could run without getting any I'll effects (i.e popping or back firing). I went through 1 inch, 1 1/8 inch, 1 1/4 inch, 1 1/2 inch all with no ill effects, but did notice better acceleration with each size up. Then I went to 1 3/4 inch and started to notice a bit of popping on deceleration. So with that I stayed with 1 1/2 inch exhaust pipe approximately 4 inches long with downward slope, but not just a 90 degree like stock. I also cut a piece of screening material as a spark arrestor and tested the exhaust with it in and out (screen material) and I didn't notice a difference. I know that some places require the screen (spark arrestor) or you won't be able to ride without it. Below are some pics of the exhaust as I designed it. Oh and it sounds great, not to quiet and not to loud, but just the right amount of power and sound. I will have it either powder coated or ceramic coated depending on how it starts to look. Total cost for mod, $15.00 (flat metal 4x8 inch and one 90 degree electric conduit pipe, both from Lowes)
:nerd:
 

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Discussion Starter #3 (Edited)
No the second pic is the stock exhaust (spark arrestor tip). I forgot to add the finished tip pic. As you can see the the exhaust tip is clearly bigger from the first photos to the finished one.
 

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Discussion Starter #4
Definitely gained some hp, you can just fell the pull. I don't have any decel popping or back firing, I bet once I add a fuel controller this will be a wicked ride especially with all the clutch mods I'm about to put on.
>:)
 

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Hey, thanks so much for this info. Really appreciate you taking the time to help us out so we dont all have to go thru the trial and error. Cheers!
 

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Great info! Thanks for this bad arse post

Popping and backfire on deceleration do seem a bit much.
 
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