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i run 4" exhaust on my car with no tail pipes, it still picks up a tenth and a 1/2 uncorked. i think every car i've ever had picks up atleast a tenth if not more.
My car (511 CID) has 4" header collectors. I did testing with open headers, 4" collector extensions, and 4" bullet mufflers. No difference from open headers to extensions with turnouts, and only 0.02 slower with the "mufflers" with turnouts. So it depends on the exhaust system, converter/torque peak, etc. etc.
Congrats to 68LAR on his new best, uncorked!
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