Straight pipes without baffles are going to pop no matter what.
If it has baffles, the stg1 map that should've been installed should make it run pretty good. Its pretty uncommon for an 04 with decent pipes and a stock airbox to pop alot.
Guess my point is I'd hate to see you waste $500-600 on a Powercommander and tune if some simple maintainence (fixing air leaks, cleaning tb's, etc) or a $150 download will cover your problems. Don't mask a problem with more parts unless you know you really need it.
Also, if you come to that point, a Lloydz VFCIII is more economical than a PC for your mild combo.
The Vic Shop, Inc