I come from the later mustang world where tuning is done by a hand held through the OBD2 port. My uncle has a 1990 Notch LX 5.0 with 4,000 original miles. He is the original owner and has modified it in the early 90's. He is looking for tuning solutions. What is the preferred method? what company can do it? He lives in Detroit, are there any shops you all could recommend? thanks in advance!