On your PCV valve question, I have seen (and purchased) two different types - the first is a one piece design that mimics the OEM one, the second is two pieces. I bought the two piece unit (at Pep Boys - I think), because that's all they had. I started throwing "Lean on bank 1" codes not long after. The light would come on, then go off. Took it to the dealer twice, spent $68 to find out the PCV valve was sucking air sometimes because of the 2 piece design. Bought the one piece design and the problem stopped.