62mm turbo on a 4.0l motor will have violent spool. It will come on very fast, and is enough turbo for 650whp+. A 61mm turbo on a supra can make over 1.0 bar at 3500rpm, and that's only a 3.0 liter engine. The exhaust (A/R) housing is too small though. You'll wanna go a bit bigger, or the torque will drop off very quickly due to the back pressure in the housing.