Ok, so about a 110 RWHP gain for 6-7 psi with a turbo. Not terrible, but not fantastic either.
How's the timing look? What is the AFR?
The timing will affect the power output MUCH greater than an AFR change, just be careful with the timing.
With that single mount rear turbo kit at 7psi, I'd think 440-450RWHP would be a nice upgrade.
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