My car has been sold...but when I dd have it I was running a stage 2 at 10psi. It spooled up fast and had plenty down low. I never had the stage 1 kit so I cant compare. I raced a TT supra who had bigger turbos than me in the 1/8 of a mile. I had him by a car link at the half way point and he still won on the back half of the race.
My money would be on AT LEAST the stage 2.
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