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I've run 2 1/4" exhaust with headers in my 69 Camaro for years. I've not felt a need for anything bigger plus there is precious little room for anything bigger (I'm running full duals to the rear, exiting behind the wheel opening). I'm running a 350, but I don't think a 400 would tax the system much more. The mufflers are Midas turbos, which were rated pretty good years ago. Not too loud but it barks pretty good up in the r's.
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