The Monza “Mirage” was a one-year only (1977) sporty body modification package produced by Michigan Auto Techniques (MAT), an aftermarket company contracted by GM; the Mirage was painted white, with red and blue racing stripes along the length of the car. It also featured flared body panels and a special airdam and spoiler. The vehicles were built in GM's St. Therese plant, and sent to MAT for modification, after which MAT would ship completed cars to the dealer. There were approximately 4,097 1977 Mirages made by MAT, but there were also Mirages created by Chevrolet dealerships, as the body add-ons and stripes were available through the dealer parts department. The 5.0 liter (305 CID) engine was the only V8 option for the 1977 model year. The standard Vega 2.3 aluminum-block engine was discontinued at the end of the model year, replaced with the Pontiac 2.5 "Iron Duke".