I am not so sure the N54 engine needs an oil catch can. Just look at what "Si-135" said... its been 5,000 miles and hardly any oil is his CC. My buddy with an Audi RS4 says his fills up every few weeks!
http://www.1addicts.com/goodiesforyou/n54-3.pdf
take a look at page 11, crankcase.
On the OCC fence...
