There is a few threads on this topic that I've read and I'm wondering if the gains are worth the swap for my pro5 n/a build. I have a header, cai, full exhaust, recently picked up a mp3 ecu. I will be doing the 1.8 plug wire swap as I picked up a 626 valve cover tonight. The guy I got the vc from is pretty much giving the 626 intake away. I will be removing my intake manifold to remove VTCS so I thought maybe if the 626 intake manifold is worth it I'd swap while it's apart! Info and feed will be very appreciated!