HKS GT2540R - 360/370 PS Output
COMPRESSOR:
-Wheel- 46 Trim - 51.7 Inducer / 76.2 Major
-Housing- 60 Inlet / 50 Outlet - 0.50 A/R
TURBINE:
-Wheel- 76 Trim - 53.8 Major / 47.0 Exducer
-Housing- GT25 inlet / Internal GT25 oulet - 0.64, 0.86 A/R
so we're talking 272kw ratted, I reckon Noel old boy will get his 300rwkw, with the right support, tune and boost!! Plus HKS underate their turbos.
To play it safe Id step it up a notch in size, but it depends really on just what he wants to use the car for.