I use a .48AR T3 Turbo off a VL calais Turbo

Perfect match. 160kw @ only 4.5psi, drives, idles perfectly.
Turbo starts to spool at around 3k with full boost at 3.8k
You dont want a turbo spooling too early on the street, your fuel consuption will sky rocket!

Either try source a VL turbo in good condition, or purchase a T3 super 60.