Stage 4 Turbo
FWIW my father has the same turbo on his car.He runs a Pat's 10"converter w/ a 3200-3500 stall which made a big difference in spool-up compared the the stock D5 he had previously.I believe they are rated at 580 HP(max)and CFM's @ 850.As far as what size the turbine wheel is,not sure but the one we ordered had a 60-1 wheel on the compressor side.HTH