Originally Posted by
rogwick
I'm having issues with my GTX28R which is now installed. Not sure if it's tune, BCS, turbo or a combination of the above. Keep over boosting, hitting 20psi on about 35% throttle.
Turbo did not appear to require any porting out, in fact looked the same as stock. Tried out the virtual dyno on the cobb while testing and although I can't hit full power (without over boosting) at about 30-40% throttle (keeping it under 20psi) I'm at 270HP at the wheels. She's more than capable of well over 300HP without trying.
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I know a guy who is running 408HP stock block, no issues