Skunk2 IM is not currently CARB legal, but they are working on it. Going from 10:1 to 10.8:1 won't give you a huge increase, but it will a little. I don't remember the equations for power increases from compression ratio increase. I was saying that the stock itr of 10.6 is pretty close to what yours will be at 10.8, so that won't be much of an issue passing smog...the ITR passes cleanly. P&P head really won't affect your emissions much either.