Once the blow-through twin-turbo system was fully engineered and tested, in a bold move, Banks started American Tubocar, Inc., a company set up to sell brand-new twin-turbo third-generation Camaros and Firebirds to the public. New Camaros and Firebirds were delivered in one door, and Banks and crew promptly pulled out their 305s and drivelines and installed 500-, 600- or 700hp twin-turbo 350ci (5.7-liter) Chevrolets and a barrage of other goodies. Out the other door came Banks’ "GT Camaros and Firebirds," and each car's horsepower was limited only by the thickness of the customer's wallet—the choice of engine-building materials and the boost settings on the wastegate.

The cars were extremely complete when they left the Banks "factory." Each engine was broken in on the dynamometer and fully tested. The 500hp version was essentially an automotive version of Banks' four-bolt-main marine twin-turbo small-block Chevrolet engine, with iron 1.94-/1.5-inch heads, forged marine pistons and an "automotive-style'' twin-turbo system, running about 8 lbs of boost.

The company sold more than 20 cars and more than 70 complete engines from 1982 to 1988, but more important, it helped Banks and his engineers fully sort out his twin-turbo kits that eventually went into hundreds of vehicles around the world. Of course, the magazines at the time got wind of the program, and in 1984 a Banks GT Firebird was tested by Car & Driver magazine at over 200 mph. The magazine, naturally, put it on its June cover, with a headline reading: "200 MPH TRANS AM." This car was also the first car tested to produce 1 g. on the skidpad. Realize that an honest 200 mph was a huge accomplishment in 1984, because even the "exotics" were "only" able to achieve 160 to 165 mph in real-world testing. Besides the GT Camaros and Firebirds, a few twin-turbo Corvettes were sold, and in 1985 a crazy twin-turbo 427 Firebird was built for a South African customer that made 1,350 hp. This was a street car that could go 240 mph under the right conditions.