ok, I think I got this...

b18c1 (gsr) =USDM 10:1 compression
b18c sir-III (gsr) =ITR =JDM 10.6:1...right?

If I run a turbo, do I do anything different to the JDM engine that I wouldn't do to the USDM engine? Also, If I'm right about JDM=ITR, the camshafts that come with that engine are fine for an easy-mild turbo, right?

Anyone seen/used the spark racing turbo kit? looks optimal for gsr.