T3 GT30 57mm compressor with 55mm turbine, "57/55." Standard 4 bolt T3 inlet with 5 bolt internally wastegated outlet.0.63 a/r 

GT series fast spooling high flow lightweight 10 blade back cut turbine wheel. Cast GT30 57mm compressor. Oil only center section. Sleeve (journal) bearings. 5 bolt outlet.

Anti surge compressor housing with 4" inlet.

This has the standard 270 degree thrust bearing. This will have best durability on small displacement engines and at boost levels lower than 18 psi.