I don't see how attaching a breather filter onto the line feeding the EGR assembly would cause such a "production" for the engine, not thinking theoretically just practically at this point.

Mind you I am keeping this extremely simple, but the EGR valve is exactly that, a valve. IF the EGR valve was to say be open, partially or fully while the turbo is creating boost, that would mean that pressure would be escaping back into the exhaust manifold right?

The amount of flow into the EGR is dependent upon the vaccuum that the cylinders create. It makes no sense for the EGR valve to be open while the turbo is creating boost. The turbo would have to work proportianlly harder to compensate for th eboost lost through the open valve.

If you ever look at the flap on the flap of a non-turbo OM606, you can see that as soon as the rpms start to increase above idle, the flap opens wide to allow air from the airbox, not from the EGR.

I looked at an OM606 turbo this afternoon at the New England GTG. This post is a result of my primative findings. What the worst that can happen while trying this experiment, setting a CEL that will clear after putting things back to normal?

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'97 E300
'99 E300