Audio Express, St. Louis

Since 1974, Audio Express has been outfitting vehicles with advanced electronics. As an authorized dealer for every single brand in its inventory—Alpine, Kenwood, and Viper, to name a few—the shop offers seamless installations, product knowledge, and full warranties. The marquee products here are sound systems, and the shop carries all kinds of receivers, speakers, subwoofers, and amplifiers. But that's only the beginning. Other featured gadgets include navigation systems, remote starters, alarms, and spring-loaded ejector seats.