The Test Track SIMPorium is the souvenir shop at the end of Test Track. Guests can purchase Chevrolet and other car themed merchandise as well as Test Track specific merchandise. Items include model cars, t-shirts, hats and other offerings.
In the original incarnation of Test Track, this shop was known as the Inside Track and also included the GM Test Track Photo area. When the new version of Test Track opened in 2012 the shop was renamed to the After Market Shop. In September of 2017 the shop was renamed again to to the Test Track SIMporium.