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Re: 2 1/4" or 2 1/2" Dual Exhaust?
Personally I wouldn't run anything smaller than the 2 1/2. Engines were designed to have a certain amount of back pressure for proper operation. I think stock 396's had 2 1/2 diameter and some small blocks, and the 6's the 2 1/4. my 2 cents.
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