KB and a '98 GT Questions

To optimize the blower, intake and exhaust mods will be necessary. Quite honestly, if you can afford it, I'd consider having the stock NPI heads ported. That, along with a set of stock PI cams found cheaply on EBay will put you ahead of the '99-up crowd without altering your compression.

Aside from that, A full exhaust, larger MAF and 75mm T/B will net you the best gains with the kit.

To tell you the truth though, I'd be saving up to beef-up the bottom-end myself. It doesn't take a lot of boost to crack a ring landing. Running the 400hp level for any length of time is going to have detrimental effects sooner or later. It's not a matter of if a rod or piston is going to go south, but when. You can beef up your engine for as little as $1,199.00. Pretty cheap insurance against almost guaranteed failure later on, if you ask me.