2005 ASC GTO Stinger Concept

The ASC GTO Stinger Concept from 2005 was a modified fifth-generation Pontiac GTO (the U.S. version of the Holden Monaro). American Specialty Cars (ASC) upgraded it with a supercharger, a Tremec 6-speed manual transmission, and other performance and styling changes.

It was shown as a possible dealer-installed upgrade package, meaning buyers could have the Stinger kit added when purchasing a new GTO. In the end, the full package was never officially offered to customers.