I'll check that O ring, somehow... I wondered why there was a vac hose disappearing into the bulkhead.
As for the K&N, I run a K&N panel filter on my OM642 300c, have done for a few years with a yearly oiling, twice if needs be.
I notice stock airbox has a venture horn on the inside of the engine bay as well as the typical intake on the wing... All I want is a bit of turbo noise. The sound of these sucking in small countries is why I choose this car over my 300c! I suppose a stock box modification may be in order.
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