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<SMALL>I have a 1991 ZR1. Originally Dyno at 303HP. Rippie chip, k&n, corsa catback and replaced bad injectors. Dyno now at 343HP. What might I expect to gain adding the </SMALL><SMALL>Ported plenum and injector housings</SMALL> / 63 <SMALL>mm throttle body and retune?</SMALL> Any...

I'm considering catback systems and have been told by a few that the Corsa systems don't resonate (at least not much!). I don't expect much HP increase but certainly don't want a decrease. Anyone have experience with these on a '91??? Thanks in advance