I was very happy and surprised that my car passed smog! I had already failed three smog checks at the Smog Stop. During the course of these tests I replaced my air filter, changed the oil, spark plugs and ran three bottles of fuel injector cleaner! And I continued to fail! Prestige Auto was recommended by Muffler Tech after they did a tempreture check on my catalytic converters. Prestiage quoted me a diagnostic charge and would apply that charger towards repairs. However they called me up that morning to tell me my car was running so clean that they ran the smog check and it passed! I was out of there for only $47.25! They were very honest and fast! Great customer service is had to find and I'll be back because of the great service I received!