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Well hat eto break it to you but your power goals with those turbos are a little over estimated...the GT25r will NOT yield 600hp with a 7500rpm redline...the 5vz-fe will need 70lbs of air at even 23-24psi...the GT35 runs out of steam...now going to 35psi that would be even MORE airflow and the GT35 would be crazy small for a nice flow....for what you want just go with a bigger turbo, you will have to deal with lag thats a given but it will at least yield you the results your looking for without dieing in the top end.
I have to run now but i will work out some compressor mapping later on if i get the chance....check out the v6 section as there is lots of discussions regarding turbo size...a recent one that Johnny_G started with some good info in there.
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