This is the Document that I had previously come across about Mercedes and smog testing.

Since it suggests that the EPA has granted an exemption to all Mercedes vehicles built since 1992 (that have ASR, ESP, ETS, or 4matic), it should apply to the Crossfire as well.

Like I mentioned in an earlier post, I brought it up to the smog tech and he knew exactly what I was talking about, and then when I suggested I should get a discounted smog ... he took $12 off. Its not too often that a Mercedes owner pays less for a service than a chevy or toyota owner would ....

Chris