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Anybody know what the ideal exhaust size is for the 5.7? i plan on running a cai and a programmer. I was thinking 3" would give me the best results but im not too familiar with the 5.7. any help would be great.
 

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BCB: Is that 3 inch setup a Gibson? I thought the OEM pipes are 2-1/2" diameter :icon_confused:.
 

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OEM exhaust systems are 2 1/2 inch diameter. But if your looking to add more performance then I'd go with 3 inch. Especially if you will be doing a few other mods to the engine.
 

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When we installed the Magnaflow, the inlet and exhaust was 3"ID. The stock resonator also measured 3"ID. I bought it used but I don't think it was modified.

BCB
 

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Discussion Starter #6
Sounds like I'm going with 3". I really like the Doug thorley but its only 2.5". Guess ill settle for the magnaflow.
 
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