The only reason to go high compression would be to compliment a set of cams. Going with a larger cam lowers cylinder pressures because of the increased overlap... thus usually you increase the CR to compensate for the larger cam.
Just increasing CR will NOT give you a noticable gain in performance. Usually, with JUST a CR change, expect 1% gain for every point you increase the CR. That will probably be negated by the amount of timing you would have to pull out to avoid detonation.
So, why is everyone so gung-ho on these pistons?? Just to add them to your sig?
If you have a set of custom cams, or are going FI then I can see the reasoning, but for a stock cammed, NA 2.5 or 3.0 it is a waste of money.
