CELLGURU's Answers for the 745 questions were accurate, ecxept for the statement of 35.6 psi for the turbo boost. That would be one hell of a pressure in the engine! The stock pressure for a 745 is approximately 8.5 psi for the newer 745's (1983-1986, I belive), while older turbo's went a little higher than that, but not too much. Christopher M Luquette 1985 745i