Not many Cheap upgrades for the GA.
As long as you hav the V6, the pulleys dont turn any faster(more revolutions(thier the stock diameter) but they are lighter and will make your car rev up quicker, so take offs are faster.
I'd get the exhaust upgrade before the PCM upgrade.
You should be able to find an exhaust shop that'll do it for around 250-300$.
BTW the SLP kit for the grand am is being discontinued from what I read on another website that had them for sale. They were going for $170 !!(+shipping) but they were all out.
Think it was here @
www.lmperformanceparts.com
I just want money and DVDs

opcorn:
I also put Leds on my list.
The ones with 6-8 connected for your interior, blue ones at that
My wifes family is wacko when it comes to Xmas.
We always have the bigass get together w/dinner and then spend hours opening presents

Everyone has to open them 1 @ a time,
so everyone can see your colourful undies & socks you got
gotta love the Holidays!