I am starting to get a little more serious with autocross and am looking for a class to build my car for. I don't want to spend a whole lot but I want the car to be fairly competitive. I currently have 17x9 wheels and I am planning on getting 255 dunlop star spec tires or something similar for the next season. From what I have read it seems that with the 5.0L engine and 9in wide tires STX is my best bet without spending massive money. Is this the case or is there a better class out there?