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Inside the 4 inch sidepipes I have a 3.5 inch cat and a 2.5 inch hotdog. I tacked some perforated steel to the outlet of the the hotdog to hold my stuffing in. Inside it is a length (about a foot) of 1 7/8 tube with a cap welded on the end. The whole thing is stuffed with about 20 stainless pot scourers.
Basically, the exhaust gas has to squeeze through the equivalent of a 1/2 inch pipe.... then go through the perforated steel. This is the same on both sides of course.
Even though it's badly bunged up, it still goes ok...
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