At the risk of sounding lame, is it possible for me to change the airfilter myself? I had a go and for the life of me couldn't get the lid off. After consulting the owner's handbook I see they say this should only be done by qualified Alfa service people as it is mounted directly to the oxygen sensor etc. I am sure that many people have done it - is there anything you need to do other than take out the two long bolts in the middle and the two on the side by the wing? Do I have to unbolt it from the oxygen sensor as well? It looks well sealed.