It has 11:1 Comp 200 PSI in all cylinders. D15 block D16A6 SI Head W Y8 head gasket the pistons in a D15 are flat top thats where most of it comes from D16s are dished. The Y8 gasket is the thinest avalible so thats some more. Also running off a P28 so redline is high Car does not smoke 1 bit. Motor has about 20K on it since she was apart never given me a single problem. Very reliable I drive 20 Miles one way from tampa to largo 5 days a week.