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Re: 2 1/4" or 2 1/2" Dual Exhaust?
My vote is for 2.5 duals also. 2.25 might be a little quieter, all else being equal, but 2.25 dual are really for a smaller small block like 283-305. I don't think engines are designed to run with back pressure, they are tuned to run with the back pressure they have. Change the backpressure, change the tuning to run right.
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