Just got my new 2004 GP2.Man that is some car.Anyways now i want to start to modify it with just the basics for now, what can i do to get more horsepower cheap now, and then maybe this summer a bit more and so on and so on.For me it's never enough. I couldn't afford the GTP so ill have to do with this one for now.

Pulley - they're pretty cheap these days.

CAI, man. If you can't afford the CAI, toss the airbox and stick on a cone.

I'm in the same boat. I haven't done many mods to my GTP yet either. Actually, unless you count the $2000 stereo...

I've got an open cone on mine, I like it. It's not a huge cost, and I noticed an increase in my fuel economy as well.