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In 1972, the GTO reverted from a separate model line to a US$353.88 option package for the Le Mans and Le Mans Sport coupes. On the base Le Mans line, the GTO package could be had with either the low-priced pillared coupe or hardtop coupe. Both models came standard with cloth and vinyl or all-vinyl bench seats and rubber floor mats on the pillared coupe and carpeting on the hardtop, creating a lower-priced GTO. The Le Mans Sport, offered only as a hardtop coupe, came with Strato bucket seats upholstered in vinyl, along with carpeting on floor and lower door panels, vinyl door-pull straps, custom pedal trim and cushioned steering wheel, much like GTOs of previous years. Other optional equipment was similar to 1971 and earlier models.
Power, now rated in SAE net hp terms, was down further, to 250 hp (190 kW) at 4,400 rpm and 325 lb-ft (441 Nm) at 3,200 rpm torque for the base 400 engine. The optional 455 had the same rated power (although at a peak of 3,600 rpm), but substantially more torque. Most of the drop was attributable to the new rating system (which now reflected an engine in as-installed condition with mufflers, accessories, and standard intake). The engines were relatively little changed from 1971.
Source: Wikipedia (original)