Set up at the top of a little one lane road, Sully's can be hard to find; look for signage off the main road, Littleton. They really specialize in towing and inspections here but also do all manner of repair. Emissions diagnostics and alterations are a very popular service here. There are usually several large red tow trucks parked out front, and while there isn't a real waiting room, you can always drop your ride off and come back when it done.