I have a 91 560SEL and I have been selected twice in a row to go to a Test only center. According to the Inspection reason on my inspection report, my model year vehicle was picked because it has a High Emitter Profile (HEP). The test center showed me a flier saying that your vehicle will be picked either in random or on the basis of your vehicle profile. I pass the test but noticed that my HC levels were high in the max levels.