I recommend getting either a Cyborg or X-37 and get an AEM WMI kit. My car on 93 Oct feels great. I can't beat a 5.0 from a dig, but from a roll I can keep neck and neck with one. If you had either of these turbos with Meth, you should be able to beat one. You're not going to beat an M3, not the new ones anyway with these turbos. For that you're gonna have to go big. I'm happy with my turbo so far, and I come from a fully built Subaru. Built as in new race block, Crank, Cams, Pistons, Studs, Rods, Big Turbo, Fuel Pump, Injectors, Aem Meth injection etc. It feels really good. Pulls hard all the way to redline. Haven't run it at the track to see what it'll do. Ill be putting it on the dyno in a week or 2 to see what numbers it puts up, but regardless of numbers, I really like the character of the car now and how it drives. Good spool characteristics and pulls all the way to redline. Just wanted to give you some options, because I think that if you drove a car with one of these turbos, you'd really like it.