the 99-04 GT has a 2v 4.6L with a 260hp/302tqhow much hp and toque was the gt 99s pulling? arent there 2 v8s around the 99-03 years? one with like 260hp 300tq and the other being 300hp n 300tq. i would say gears w/t-loc, duals w/longtube, udp, TB, tune,port and polish upper and lower, cai, alum fly wheel, and take out all the junk in ur trunk out. Also you could delete your back seats to help you out . That should be under 3k and i would put my money on you if you would race >.>. hope its enough lol
imho, save up for a s/c.
but, the combo b1lk1 suggested would probably scare the sh** out of any stock/near stock PI GT.