I know i have to install a BOV even if it doesn't help the gearbox. But i really am not that eager to turbo charge my car, i don't like how turbo deliver power. I know many of you disagree. what i am thinking of doing is preparing a very powerful naturally aspirated 3.4l 24 valve engine based on the 3.0 24 one, the reason: well the main crank on this engine is only 80.25 mm good for high revs.
Here is the plan, i have a C36 amg head (engine head with cams and the lot)
Then i will by an e300-24 block machine it so as to fit some very light weight pistons of the same size of those of the c36 engine, along with light weight con rods. This will give me a 3.4 capacity, and the least 7700 rev limit.
By the way 300EVIL have you tried retarding the exhaust camshaft on your E500 and E320? it is easy all you have to do is(with main crank set to zero marker) take out the cams sprocket gear and refit one pin forward ie in direction of engine turning, now when you reset the cam gear to its marker the cam it self will be retarded, it will give you top end power and free revving engine. I did this to my m110 e280ce and the top speed of my car jumped from 200kph (124mph) to 230kph (143mph) at 7100rev cut out, and the power from 5000 to 7000 was incredible. just try it man and let me know.