Don't know about the super bit, but I used random technology cats - 3" in and out, spiral wound element, actual catalyser is much shorter than original,runs much cooler and is much louder. Got mine from Dan Cragin when I was in LA and they were packaged with rest of exhaust but think the price was about $325 each. Don't know how well they work but exhaust smells clean and power with rest of system is certainly stronger (and loud)
I'm pleased with the result, feel like a V10 hooligan!!
