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I did a similar mod to the OP except I used a 1 5/8"holesaw to cut the holes in the top of the muffler and I drilled 2 x 5/8" holes straight through the internal pipes and then welded the top back up. The PO had done the Crios mod already. I can't imagine the exhaust sounding better than it does, it has exceeded my expectations. It's absolutely perfect. All it took was a bit of time, some argon and some filler wire(I'm a professional welder/machinist). I will say that welding the muffler is not easy, it's double walled and each wall is super thin.
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