Porsche pulls a vacuum on the block to keep things from leaking and to make some power by offsetting the piston movement pumping action.
Go to a puke tank situation and block off that vacuum line to the AOS and watch what happens
It will leak from every seal possible
2.5 cars? 6200 rpm? not needed. Box-S 7200? Needed. The piston size on the 3.2/3.4 is MICH bigger, which means more pumping pressure from the back side of the pistons.
B