Well your gonna need the info for you engine. You might have to get a tuner or something to be able set up the MAF to your setting. I read that you swaped out an old svt for a new engine, was it another SVT 2.5? I had a 75mm maf from pro m and they never could get it to work right. I sent my stock one in and decided not to keep the product and to just get my money back. They are kinda slow over there, atleast with me they were. I think you should just get the contour one, I believe the stang ones and SHO ones are different. But I am not sure, anyone else?