l know lots of NHRA class racers bought and tried them back in the 1980s when they first opened and started making and selling converters, not many where happy with them
Hi Po and race Converters have a really big need for highly skill machine work and tolerances being built, not every shop can do that time after time
i have never bought or use one of theirs based on that, maybe their good on some other brands beside Mopar converters