I am by no means an expert at convertors, and to be honest barely understand them. To my understanding, they work like a clutch. The more power you want to be able to bite the more you'll need a multi disc. I had a single disc in my car n\a but had to step up to a multi disc with nitrous. I know nothing about what power levels require what type of set up though. Hopefully someone can answer in beter detail, and clue me in a little more.