For all out drag use go with the following combo on an SR20.

Stage 5 T3/T-04E hybrid turbo. 60 trim 76mm BCI-4 or BCI-8
compressor wheel in 0.60 A/R T-04E housing. 76 trim 72mm T350 turbine wheel in a 0.82 A/R turbine housing.

Ball bearing center section.

Run the 60 trim compressor wheel.
Dont run
a 60-1 wheel (shit) or the smaller trim T-04E wheels. This turbo will
support about 475-525 whp and will boost up to 30 psi. At this boost level you will need a metal head gasket. The stock SR20 head gasket tends to blow above 24 psi. Expect soggy boost repsonse below 4500-5000 RPM.

For better spool up and more power get the turbine housing Extrude Honed and Swain coated.