Mate now your coming across like a real tool, seriously. At first you stated you were going to 'push' these bad boys to high 300's. Totally wrong turbo for that. Then then said 'fine 500 it is'. That there is two totally different engines, setups, purposes and budgets. You have been asked three if not four times what the A) use for the car is, B) redline, C) what sort of curve you want, D) if you want low mount or highmount. You have said you bought the low mount 2835's because of defect's, which is great. Alot of us are in the same boat espeically those Mexicans in Vic.
You have also said that the engine was built to take 'about 400rwkw'. If thats the case why are so keen on using two different setups which will go 500 +. Its like buying a 600 HP Kenworth prime mover when only needing to tow a box trailer!
Most of the guys offering opinion's in this thread have built GTR's in their garages right now, get driven and have take a particular route BECAUSE IT WORKS! I, myself am going from RS's to -5's on a stroker motor becasue its a laggy POS. I couldn't imagine one size bigger turbo's on a engine thats 200 LESS CC