why a custom built converter isn't for everyone....

12many said
Here’s an example of FTI 9.5” converters with part numbers listed in their catalog, and the wide range of stalls available including a custom option. One could call them “off the shelf” but they build them as ordered I believe, at least for Mopars. I think you’d have to have a pretty unique build to really require a truly custom in a 9.5” street/weekend strip up to 750hp setup. IMO, I’m thinking everyone else that sells, in this case 9.5” converters, may not list their offerings like FTI or TA do, but when calling one just assumes it’s going to be a “custom” but it’ll be one of theirs they have sold to many others. Won’t be built “just for your setup” They’ll just recommend one of them with the stall they offer best suited for your deal Street Racer Series Torque Converter - 9.5" for 727 - TF8

Exactly what I mentioned earlier. People call and tell their build, and most of the time one of their "off the shelf" already built converters is close enough to fill the bill and that's what they ship. People get all shook up because they want to think every turbine was fully implemented with their build, and only their build in mind. So many builds are so similar that the need to weld every tooth on the ring gears especially for Jon Doe's car is ridiculous.