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The Holden GTR-X was a concept car made in 1970.

The car was another ambitious and inventive product of the GMH Advanced Styling, Research and Development divisions. While its knife-edged surfaces and aerodynamic form were largely inspired by the experimental Hurricane, the GTR-X represented a serious attempt to build a low volume, high visibility sports model using inexpensive tooling and stock mechanical parts.

The GTR-X was been built specifically to test design concepts and help assess the Australian market for a locally designed and manufactured two-seater sports car. Designers began the project in mid-1969, taking full advantage of the freedom given to them by using fibreglass to create several styling proposals before finalising a full-sized clay model.

The three prototypes that eventuated (only one complete vehicle survives today) were strikingly. The GTR-X was very much aerodynamically designed. It had a long, sleek hood and a low wedge-shaped grille. The body line sweeps up at the rear to an elevated tail light assembly. Even more aerodynamic styling includes concealed headlights, a sharp windshield rake, recessed parking and turning lights and flush petrol filler access and door handles.

The 1043kg car was reportedly able to reach a top speed of 210 km/h in testing and was fitted wîth four-wheel disc brakes. It would have been the first Australian car to boast this feature had the project not been shelved due to financial viability.