doing any upgrade, especially one where you learn something is never a waste of time

I know that I would be learning somthing, and thats part of the reason that I want to do it so much, but I mean, performance wise/sound, is it a waste of time?

debatable, you should get more performance, as for sound that is a big opinion type thing (my father in law says the gp is too loud with stock mufflers)

well i like it loud/want it loud of course :) ... i just have an aftermarket muffler, and my piping is 2.25... i would assume it will make it a little louder, what do you think?

probably, especially if it's a cheap muffler (packing and quiet costs money to build)

yeah its some Xlerator brand... prettymuch came with my car (dealer paid for new muffler)... it sounds nice at idle, but when you get up to 4000 = ricey :(