Quote:
Originally Posted by ML
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I saw the dyno on page three comparing an open header to a 2.5” exhaust. The peak difference was 8wtq, which isn’t insignificant, but the 3” exhaust would probably be in between the 2.5” and going wide open, right? If someone is squeezing all they can from a NA build then maybe they should go 3”, but it might not make a huge difference, and it may not be worth cutting or buying new components, if that would be necessary.
Not to say that a larger exhaust wouldn’t yield more power at the same boost, but there are turbo Supras making 700whp+ with a 3” exhaust, so I feel like 2.5” would be good for a third to half that power.
What does a 3” exhaust sound like for a NA setup? I feel like the classic drone and fart can sound will be there for anything except WOT at high rpms. Maybe good for the track, but may not sound great around town. Like I said, I typically like a faster flowing sound to the exhaust note, but that may not be ideal or deliver maximum gains.