Call PTC, Ultimate, or anyone else. Tell them your build from bumper to bumper, and they build you a converter specific to your car. Sounds good, and it is. But that doesn't work for me and here's why. My combo changes like the wind. The TC built is now the wrong TC because I swapped cams, gears, or even engines. Yep, I could send it back and have it rebuilt for every mod change, but I don't want to pay 300 for every change I make to the car. So, a general purpose of the car "off the shelf" quality converter is best for some people.
