I've got 3 inch exhaust from my headers to a set of Doug's cutouts and to the X pipe. Everything from the X back is 2.5 inch. It clearly isn't a kit.
If you have any kind of performance setup, 3 inch is the way to go.
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77 Trans Am, 469 w/ported E-Heads via Kauffman, matched HSD intake, Butler Performance forged rotating assembly, Comp custom hyd roller, Q-jet, Art Carr 200 4R, 3.42s, 3 inch exhaust w/Doug's cutouts, D.U.I. Ignition. 7.40 in the 8th, [email protected] in the quarter...still tuning.
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