As some may remember my post on added compression and the 1 point of compression not doing much but adding a few horsepower to my 511. Old compression 11.26:1 and my current compression 12.5:1. Results: old best with 11.26 was 1040@130 and new best with 12.5 is 10.06@134. There were a few other changes, but nothing that's worth much to the 4mph gain. I once again I will say compression is a big part of your combo and here's the proof.