I can only speak from experience. When I went from 1 /34" w 3" collector to 2" w 3 1/2" collector my car went faster in the 1/8th. I want to connect my 3" exhaust but a tapered 3.5-3 reducer and the X pipe I have and reusing my Walker dynomax mufflers doesn't appear to fit. Engines no way as much as you have. Been 12.0 @ 110 in 1/4 with old headers.
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