Headquartered in Manassas Park, Advantage Certified specializes in luxury cars and brands like BMW, Audi, Porsche and Mini. Cars from around the country are individually selected, thoroughly checked over and certified based on cosmetic, structural and mechanical inspections. It also has a detailing center and a service center, each staffed with Master Certified Technicians. All vehicles come with a 5-day, 250-mile 100% return policy.