You should work with this guy on a regular basis. His mind never stops thinking about something else to improve on, even if he has done it a thousand times before. Sometimes we're , but I do it to stimulate his mind (like it really needs it) and he quite frequently comes up with ANOTHER stroke of genius on some foolishly simple trick that really makes these things go.

I'll take my turn here--simple things for the poor man like me :

Stage 1: SCT tuner (none other required--IMHO), Catback exhaust, gauges.
Stage 2: SCT tuner w/ Matt's tunes, Turbo back exhaust w/ kitty delete muffler optional, fuel system pressure upgrade, CCV reroute.
Stage 3: Stage 2 plus: Bigger turbo, larger intercooler, straight piped exhaust 4" turboback, complete fuel system upgrade, 190+ cc injectors. You MIGHT want to consider somekind of A/M cottongauze airfilter/intake at this point. Depends on how often you want to change your turbo impeller when it gets trashed.
Stage 4: See Matt.