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One thing I should add about this mod- I didnt get it done in an hour! Also you'll likely need a new hole saw, and a wooden dowel to put in the exhaust pipe to provide something for the pilot drill bit to keep centered on. I didnt get the dowel- instead i used a 1/8" drill bit and drilled all around the 2" circle. Actually- I'd make the circle smaller at least go with 1 7/8" or 1 3/4". Measure your exhaust adapter and make it the size of that hole.
