lol... IF a guy builds his combo and doesn't intend to change anything, custom is great. IF you are trying different cam/heads, even different engines and gear ratios, then the custom converter is pointless UNLESS you send it off for each and every mod that is done. I don't have 5,000 dollars in converter funds to keep up with my forever changing part swaps :) Make that 50,000 for all 10 cars :D