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I can't remember what the original size opening was on my 359. I drilled out the center baffle to about a 5/8" -3/4" hole, and did the same on the outside, welding a short pipe around the hole. Later I learned that the cat mufflers have an internal platinum coating, which is hazardous to your...

You might also suggest to your buddy that the stock 359 is a known dog, but has proven to be one of the greatest saws to modify, the power gain is awesome. At least a muffler mod will help, if he doesn't want to go to the extent of having it ported and piston work. The muffler on the ep model...