Mark is a great guy. Unless you have modified your motor with a cam, heads, or exhaust he will most likely talk you out of it. He really likes the stock program for the 350MPI and doesn't think Merc left much on the table. My dad had a shop in Arizona do his 01 computer and he had nothing but problems. Sent it back 3 times and finally asked if he would revert it back to stock. They wishy washy wouldn't do it and finally was referred to Mark. He put the comp back to stock and the power and smoothness came right back. Was very good to work with. If you have anymore questions, I can elbaorate more.
