i had my 4dr d series boosted wit a ebay kit.dont ever by one of those ss auto chrome manifolds, its like they made outta aluminium foil.but besides that my shit ran fine and pulled hard as hell in 1st,2nd and 3rd gear. i have a t3/t4 50 trim turbo but its to dam big to much lag. but like charles(main stream performance) said a t25 is the ideal turbo size