I love the Idea of Building a N.A D- Series. However I have some doubts. First off I have a EJ8 with a stock D16y8. What I want to do is a higher compression piston swap and the usual I.H.E and valve train work. What reliability issues can I run into by running high compression. I want to run something that will still run on pump gas, so the comp ratio to be in between 10.5 to 11.5. What piston choices do I have? As far as tuning goes, do I really have any option while still keeping it OBD2?