Mac's Shell Doing Business as Mac's Auto Repair & Convenience Store is a Certified Emissions Repair Facility for Massachusetts. We Do Inspections for autos as well as Commercial Vehicles and Motorcycles. All of our Techs are ASE Certified and we do complete auto repair including Air Conditioning, Major Engine Work, New Car maintenance, Electronic Tune ups, 4 Wheel Alignments, Brakes and Shocks. We are a member of the Tech-Net Auto Service Network which provides a written guarantee on repairs and will protect you nationwide at participating repair facilities. We also offer 24 hour Towing and a convenience store.