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Two questions...
I want to go with 2 1/2 inch pipe. Is this measured as O.D. or I.D.?
Next, is there supposed to be a donut between the collector and the reducer? My reducer came with a gasket for the flange, but will the flanges from the collector and reducers even meet? Is it this compression that makes the seal?
I got the Hedman Elite ceramic coated headers for my '86 460.
Any other tricks or suggestions?
I guess this was more than two questions, but you know what I mean (I hope).