What mja said, it'll cost you 3-4k minimum for parts alone, plus fab/install/tuning.
Full bolt-on 1.4T: intake, full turbo-back exhaust (downpipe, midpipe, 2nd cat delete, catback), 42lb+ injectors, IC w/hard charge pipes, and a solid tune.
Ditch that Diablo, dont care who you use for tuning (except the one that starts with "T") as you'll make more power and be able to get it retuned for new mods.
You already have an intake, downpipe, and 2nd cat delete. If you dont have the midpipe, get that and a catback. Then buy an IC kit w/hard charge tubes from MPFab, BNR, ZZP. Finally, hit up BNR for injectors and an AutoCal with a custom tune. Will get you to 180-190 hp/220-230tq on 91-93 IIRC. If you have E85 available in your area, buy 52lb injectors and get the flexfuel kit when you buy the tune. Gives you a decent power bump.