Personally, my plan to date is to use the 3L heads unless finances prevent me from going in that direction. Since timing and fueling is optomized with the 3L setup, I figured a chip of some kind could provid the added performance that the baseline 3L PCM program could not. This way I don't necessarily have to worry about the fuel and timing maps. I'm just finding it hard to believe that there is no way to get similar performance with the 3L pcm.
