I have noticed that the cover has a small piece out of it along the edge at the top left at the back of it, so a small piece of the filter can be seen, that is the rubber edge of the filter not the element. I looked at it closer but it does not seem like a piece is broken off it but is part of how it was made?
Also what engine oil do you recommend for this engine - I use semi-synthetic but is fully synthetic better (car has 117k)
Also exhaust fumes in car when blower is on with air directed to face or windscreen when going slow or stationary- have read other stuff about it that its leaking injectors??