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I saw this on the facebook posting for rr racing. On top of the supercharger update there is a mention o a 3 inch exhaust in the works for the isf. There is also a comment on possibly seeing of there are gains of such a exhaust on a na car . Would this be the first 3inch offering for the isf? I think borla, joez and the xforce are all 2.5 right?
You're right. All current exhaust offerings on the ISF are only 2.5'' piping. I'm sure there will be advantages/gains going up to a full 3'' piping setup. I mean, there are guys in the Honda world, (i.e. the K20a2) running 3'' exhaust setups with considerable gains.
I suspect the 3" pipes would only yield a significant increase in a forced induction setup - I think headers and 2.5" exhaust in an otherwise stock motor is probably enough.