I'm getting ready to do this mod as per the picture.
Two questions first though.
I was going to use a 1-1/2" hole saw to cut the first baffle, but could not find one deep enough to fit over the stock inner pipe on the first baffle. Every hole saw a found was about 1-3/4" deep. The tube is about 2" long. I modified a hole saw by cutting it in half and welding on a length of pipe like I've seen elsewhere. Just wondering if that's what everyone else did or is there a better way?
2. If my math is correct then the four 1/2" holes in the second baffle have the same area as a single 1" hole. Any opinions as if a single large hole would perform better than the 4 smaller holes? I'm thinking along the lines of which would flow smoother (turbulent vs. laminar exhaust flow).
