California's Brass Junkie Co. is toured, where even the art probably has a V8.

From pieces of scrap and twisted metal, Joe Magliato makes strange, beautiful and singular rat rods, all out of his small Southern California shop.

Gary Kirston has owned Bethlehem Motors for 40 years, and takes pride in restoring a host of classic European cars to prime condition.

SpeedKore is known as a multitalented shop. In addition to being top restorers and modifiers of vintage American cars, it also rebodies contemporary iron like the Ford Mustang and Dodge Challenger in carbon fiber. In short: the shop adds lightness as well as power. The result? Brutal, brutal speed.

Based in Ontario, California, in the heart of Southern California's car culture mecca, Bisimoto is an engineering shop with a tendency to indulge customers' ludicrous ideas.

Sheepey Exotics takes supercars—like the Lamborghini Huracán—that cost hundreds of thousands of dollars and come equipped with more than 600 horsepower, then makes them faster and more expensive.