We were referred to them by a mechanic from another shop. After looking at my Expedition's catalytic converters, he had concerns that it may breakdown again if we didn't find the root cause of the problem. Previous recommendations from a Ford Dealership & other shops we went to, only replaces the bad catalytic converters. After teaming up w/ Hanlon Auto Service, our Expedition runs great just like before. This is the kind of exceptional experienced mechanics that I'd love to put in my address book and refer more businesses to.