DIY- Awesome Stock Exhaust Mod!!

Maybe this will help

The 1st attachment is a pic of the muffler cut in half. On the left half side, the hole on the right is the one that we cut. It is about 3 inches or so in diameter. This lets the air not build up in the 1st chamber, and lets it just come out.



The second two are just more cross sections.

Sorry, here is the very forst pic.

Here it isafter it was welded back up and painted.



Once I get it mounted back up I'll do a sound clip and post it. I already mounted it quick before painting and it sounds pretty mean. By the way, I took this to a local muffler shop and had them chop and weld it. They did it for a couple bucks. Also take note that the guy at the shop said that the metal the muffler is made out of is pretty cheap stuff. So if you are going to weld this yourself, you may want to start at a really low temp, or else it will burn like you are trying to weld paper.

The pipe is somewhat raspy and it is much deep on the low end, then it gets higher as you get up on the RPM range. Keep in mind that the sound clip/video was done on my point and shoot digital camera, so in person it sounds a bit better.



All that I did once it was cut open was make the hole that you see in red. You could make bigger if you want, or just remove the entire back wall. If you wanted to you could also close off the two holes in blue, and cut the uncircled one shorter. Then you would elimate using the front chamber altogether. I'm not sure how that would effect sound though. It probably would make it louder. Obviously don't cover the yellow hole, that would make you very unhappy as it is the outlet.

I hadn't heard of other people doing this exactly. I have read where people drilled holes through the outside of the exhaust, or through the plate without cutting it open. My concern with doing it that way was having loose junk rattling around in my can, plus I couldn't have made the hole as large as I did. The whole thing, after the pipe was off the bike, took maybe 2 hours max.