well, I am ready to upgrade my turbo, but I am having a hard time deciding which and what kind of turbo upgrade kit to get. I've been looking at the ATP stage 3 and the AGP stage 3, they're kind of expensive, around $2,400 for both, then I am looking into the Hahn turbo super 20G, don't know the price for that, i have to call. The one that reallly calls my attention is the HP performance turbo upgrade with the garret t-3 comes with everything to bolt on for just $1,480, and I talked to the sales guy from Hp and he said everything else stays the same I wont need injectors or AFC ( piggy back) all I will need is a BC & turbo timer.
I want to make at least 325 hp at the wheels, I know I still need the cat back w/ high flow cat, and CAI, If I get the Hp turbo up grade what else will I need, specially will I need a piggyback apexi afc? Help!

(also what do you guys think about the monster intercoolers with 1 year warranty on ebay?)