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I had quite a conversation with the gentleman that headed the "Smog" program in Colorado one day. He told me that the easiest way to get a car to pass the tailpipe inspection was to 1. Change the oil. 2. Change the spark plugs (gapped correctly) and 3. get the engine hot before taking it in to be tested. (not overheating hot, but drive for 15 minutes hot).
Worked every time for me. As to how to get around a visual inspection, can't help you there.
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