My check engine light came on and I was told by other shops that it was my catalytic converter and it would cost 800-1,000 to change it. I thought that was pretty steep so I went with a friends recommendation to check with Big Als because they do a good job and charge a fair price. I called 2 different Big Als locations and they quoted me over the phone a price of $300 including labor - I was impressed with the good price. I went to Big Als the next day to drop my car off.... An hour later I received a call from Big Al saying they ran a diagnostic test which showed the issue was actually a misfire in the 4th cylinder. Big Al noticed a big gap with my spark plug as the culprit - they not only resolved the issue but it was FREE of CHARGE! Because of Big Al's honesty - they have not only earned a customer for life but I will make sure to refer all my friends and co-workers for their car issues. Big Al's - honest work for a fair price!