2.5" exhaust vs 2.25 or even 2"

rumblefish360 said

@Ccas Good post. Very true. A .5 ET drop is generally recognized as an easy 50hp improvement. And yes! That is a huge gain racers know about.

@Hamerhead IF! Headers are a certainly in the future, I would do both at the same time. On a DIY level, it is easier. You won’t have to cut and splice piping.

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Yep, I didn't mention headers but the same logic applies. Anyone ever see a shop bent set of headers? ;) They are all mandrel bent for a reason. Anyway, If you have a nice pair of headers, you are going to free up 25 hp +- when in the 400hp range but it will be largely nullified with a compression bent exhaust system attached to it.