Ok well I love my GSR. Nice and quick. Now I want to make it just a bit quicker. I know I'm going down a very long road

But I really just want to do a couple of simple things. I don't have the money or know how to get real crazy like I see on here

Some of you must have some really fast cars!!!!!!!
Anyway I have tried to do some research here and it looks like the first step will be the AEM SRI. Looks like a good first mod and maybe it will ad a little something to the performance. Now it looks like the second mod would be some kind of exhaust??? Am I on the right track here? Suggestions?
I like the SRI because it looks easy and is cheap. Could someone give me maybe one or two more ideas for fairly cheap mods after the SRI.
Thanks for the help!