It's interesting how this thread turned into a discussion about what is better.
I remember when Subie Sport Magazine had a 2.5RS and built a NA engine to compete with a turbo engine, well they failed. Does it mean that NA is bad? Maybe, at least I think so.
However, looking at this past year of professional racing, NA FWD Honda Civics outperformed more powerful AWD Subarus. Subaru lap times were better, but the Civic did not have to stop for 2nd or 3rd pit stops to refuel.
In time attack or club racing it's a totally different story. You only need to be competitive for 20 minutes or less. Overheating rarely becomes a problem and tire wear is not as major of a concern. Unless of course your pushing serious power or really do not know how to drive.
Getting back to the discussion, what is most likely going to happen, I would like to post this link
TOYOTA: Company > Technology > Improving the Environmental Performance of Internal Combustion Engines \ Engine . At the bottom of the page you will find that the OEM Toyota engine has close to a 12:1 compression ratio.