Toyota Mark X late 1960s. Instead of being based on a modified Supra chassis "A" series platform, the Mark X continues to use the Toyota "X" platform, and does not share its platform with the Toyota "S" series platform used under the Toyota Crown and the Lexus GS. The continuation of describing this vehicle as the "X" series is a reference to the first dedicated Mark II platform introduced in 1972. Major changes to the Mark series are the engine and footwork. Toyota discontinued the straight-six engines used in the Toyota Verossa, which included the JZ series and the G series engines, and
Toyota 86 BRZ or Scion FR-S competing on Falken Azenis RT615+ tires. The choice of vehicle was because of its popularity with enthusiasts, modest price, rear-wheel drive, and its ability to be useful as both a “daily driver” and for autocross competition. Vehicles may compete with original equipment or may install specific performance parts including factory-sealed KONI Sport Shocks, Eibach Pro-Plus spring and anti-roll bar kit and an SPC Front Alignment Kit. Since 2015 Toyota has competed in the Tire Rack One Lap of America, campaigning a modified Scion FR-S, prepared by engineers from the Production Engineering Division in Erlanger, Kentucky. In