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Give me an idea of what power and boost you are realisticlly looking to run and make.
You could go with a Trust GT30 and dependant on the A/R rating of the exhaust housing you could see 500hp.
Another good one from HKS is a 28-35 to say 30-37 for good power. Both are ball bearing turbo's so should spool nicely on the RB25DET mill. You will see a bit of lag say to around the 3,700 rpm mark before you break into boost thresh hold for the bigger turbos.
I would also upgrade your fuel delivery system including fuel pump to a bosh 044 WITH non-return valve, and some RX side fed injectors say around the 550cc mark min. You will need other bits to make it all work properly but I have seen quite a few R33 GTS25t's pushing over 400 hp at the wheels with simular combinations at only 1.1-1.2 bar of boost. It is all in the setup and tuning.
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1992 Silver R32 GTR tickled to 450hp. - Sold when I left NZ in 2004
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