I'm hoping to have about 8:1 or lower. Depending on the true compression, I'll use a thicker head gasket to get the goal compression. Dished is the way to go with high boost. You want as low initial compression as possible to avoid detonation. The low compression will be compensated through high boost. You can use a mid-high compression motor, but detonation is complicated to avoid. Timing is difficult to control since the timing has to be retarded so much to avoid detonation. I told Ross the engine build characteristics and boost levels I want to achieve, and they built my Pistons to exceed those requirements.