2002 GP GT and all iv got so far is a FWI and a 180* tstat ... what kind of DP should i get to go with this? if i get one without a cat will it attach to my current one if i get it welded? basically i want the cheapest DP setup i can get ... and does it delete the u-bend if i get a DP? - thanks also is it worth it to port my throttle body? i was thinking of doing that - thanks