In 1989, Callaway introduced a Speedster which was culmination of their styling, engineering and trimming talents. Nothing about Callaway’s Speedster was reserved, and this is especially true when investigating the specification. The car had 450 horsepower. This figure was a tremendous amount for 1989, and was one of the most powerful accepted by the American EPA for pollution standards.
To create such a car, Callaway had to tackle several problems, and the first was fitting the new twin turbos, complex engine headers and airbox in an already cluttered engine bay. Adding turbos to the existing GM engine meant Callaway had to develop several new systems. These included new engine mototronics, fuel injection system, and an exhaust system including custom headers and catalytic converters. Despite an initial planned production of 50 examples, only 12 Speedsters were manufactured.