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Originally Posted by flashed
Which size would be better for a stock 5.3 engine ?
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If you are referring to the exhaust systems, the answer would be the 2.5” system in your application. If you are referring to the coming headers, I wouldn’t put 1-3/4” headers on any LS engine other than a stock 4.8L, but others do use them on 5.3L engines.
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