A drop in filter won't give u any hp increase. Do the CAI (cold air intake) or don't do it at all. The plugs don't matter until you start using nitrous or high boost levels.
You don't have to find a GTP boost gauge, you can use an aftermarket one from summitracing.com and just mount a 2 pillar guage along the side like I did. I have a boost gauge and a trans temp gauge. I would use the fuel pressure gauge but I have one on the fuel rail so I can check things in there if I need to adjust.
If I was you and you wanted to make it faster (not exactly super fast but faster then it is) then your gonna have to invest in some money. Go fast = $$$
If you have AIM, IM this guy jaypayso2003
He is very smart when it comes to modifying Grand Prix's and has a very quick one himself. He will anwser any questions you have.
here is his website
http://www.gotbooost.com/
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