Just got a GTP, have a few questions for the experts

[LSXHP]

I'd do exhaust mods, then get a Stage 2 Intercooler and 42.5# Injectors...drop to probably a 2.8" pulley...with a good tune of course.

Exhaust mods? I think im done with those for the most part, got the 3" down pipe, with no cat, the pwr log, magniflow high flow resinator....dont want it loud so I left the mufflers which I hear aren't restrictive...