Turbo Stage II upgrade – sled puller: T-Series HP6668, .84A/R Ceramic Ball Bearing Turbo, 650HP, 1300 ft/lbs. Turbocharger only.
My guess would be a 66/68/.84 they generally have small housings. Saying its a sled pulling turbo only isnt really true but they try to make it sound good.
That's what they have listed for the stage 3 listing when it clearly says stage 2. Too much money IMHO.