The TT big valve kit really isn't going to do anything unless you have substantial headwork. I usually go with this combo: stock intake and +0.5 exhaust. Since you're going to be running boost, consider going with 1mm oversized on intake and 1.5mm on exhaust, IF you're going to do some valve job or port the head. If not, just go with a 0.5mm bigger exhaust. Really, there won't be that big of a difference over stock..