I've had cars with leaking PCV air and running really rich to a point that the more rpm the car makes, the more power it loses. But those were NA cars, not boosted.

So it makes me wonder how much of power loss a boosted Audi will have due to leaking Valve Cover gasket which is essentially leaking PCV.

Is there someone who can take their cars to dyno before and after of the leaking valve cover gasket? I already replaced mine