I seem to remember a while back that someone suggested using B16 pistons (not the CTR slugs) in their B18B/hybrid motor to achieve a comp. ratio higher than the ITR pistons but lower than the CTR ones. I found some numbers and did some quick math. I came up with a comp. of around 11.3:1 for B16 pistons in an ITR. Is that about right? With all the Si's doing engine build-ups I would think these would be easy to find too. The only problem I can think of might be some incompatibily with the ITR rods since I know CTR pistons will basically drop in to an ITR, but when installing them in a B16A the rods need to be modified.