Quote:
Originally Posted by G37sHKS
Im not trying to hate, I would love to see some new mods that prove gains, but this before and after is not accurate,
Its test pipes VS headers and Tune...
the tune alone can give 20 HP.. unless i missed something..
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That's very unlikely... also, keep in mind that the previous tune will not be optimized with the new headers, therefore it still gives you a good idea of the approximate percent gains over test pipes that could be achieved with them (and a tune).
If we want to be ultra conservative about estiamtes though, I'd say probably 2.5% of the gains are from "just" the tune. That fits what his shop claimed where the car was in the 320's before additonal tuning.
So figure about 4% without tuning, which is still pretty good considering that's over and above any gains realized from TP's.