I've been running GM Stage 2 for 4 or 5 years now with no cooling mods, and I've been okay. I was planning on adding cooling mods on this past summer, but decided to start saving up for a new car.
If don't plan on going any further than a Stage 2, then you will be fine. Otherwise, I would just save up and get the Stage 3
GM Stage 2, K&N Cold Air Intake, 17" Motoring Drifters, Autometer Boost Gauge, Aeroforce Interceptor
1 of 1012 Onyx Black 2004 Ion Redlines