tuning rb26dett engine

I have a R33 GTR V- Spec putting out 370 bhp on standard turbos and ecu. The only engine mods are a HKS priest exhaust and HKS induction Kit. Im aming for 450 to 500 Bhp by repacing the Turbos with after-market ones and installing an ecu. Does anyone have any suggestions as to which turbos...

After an engine switch, I've been left with a load of engine & transmission parts that I need shot of : - RB26DETT R33 Engine block (bored to give 2.7 litre on standard stroke) - £300 - RB26DETT R33 Crankshaft - £100 - RB26DETT R33 Cylinder Head- £200 - RB26DETT R33 Cams - £150 - R33 Rear diff...