Introduced in 1967, the new GTX was the model that Plymouth's intermediate line aimed at performance minded buyers. It came standard with the "Super Commando 440" engine rated at 375 bhp or for an additional $546 you could have the 426 Hemi and a rated 425 bhp. One of those performance minded buyers was Richard Petty. In 1967, driving a Plymouth, Petty would win 27 races in 48 starts, including 10 consecutively.