GTHO XY Falcon
Winner of the 1971 Bathurst 500, driven by Allan Moffat, the Phase III has been described as "...simply one of the best cars in the world, a true GT that could take on Ferraris and Astons on their own terms..."
The GTHO's 351 Cleveland engine produced over 380 hp (283 kW) which, back in 1971, was grossly underrated to 300 hp (224 kW). Initial cars were equipped with an electrical rev limiter which came into effect at 6,150 rpm. With the rev limiter disabled, the engine was reputed to pull in excess of 7,000+ rpm, even in 4th gear. The "HO" portion of the name stood for "Handling Option", these options included bigger brakes, stiffer suspension, a front spoiler, a choice of 3 differentials and an optional close-ratio gearbox making the production GTHO very similar to the race version.
The GTHO held the mantle of fastest four door production car in the world for almost 25 years.
And if you want to dispute the definition of HO meaning "Handling Option", you'll need to supply a signed letter from Ford Australia (which is unattainable), because It did not stand for Homologated Option!