Here's a 2006 WRX that we built that exceeded expectations. This car is running an IAG Stage 3 Tuff Block, mild built heads using BC 272 cams, Perrin Rotated Turbo Kit running a GTX3576, Perrin FMIC, ID2000cc Injectors, Walbro 450lph Pump, UEL Haeder, TBE, and a handful of supporting mods. We tuned the car using the Cobb AccessPort on E85.
We were very impressed with the results for this turbo as we were only expecting around 550whp. This car, however, just kept making power and we stopped at the 600whp mark as that's about the limit for this block. The really impressive thing is the spool and how wide the powerband is for a 600whp car.
Here's the tune at 30psi on E85:
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