I have a 1987 560SEL. Does my car have a cabin air filter and if so, where is it? I am smelling exhaust or something like it in the cabin of the car. I dont know how to tell if it is circulating through the trunk or coming in someplace else. I've had Midas look at the exhaust system and they've told me that my exhaust system looks great, so I'm kinda lost here. Any help or suggestions would be greatly appreciated!!!