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The E series of 911s for 1972–1973 model years (August 1971 to July 1972 production) consisted of the same as previous models, but with a new, larger 2,341 cc engine. This is known as the "2.4 L" engine, despite its displacement being closer to 2.3 litres. For 1972 the 911T (Type 911/57) was carbureted, except in the US and some Asian markets where the 911T also came with (MFI) mechanical fuel injection (Type 911/51 engine) with power increase over European models (130 hp) to 140 hp commonly known as a 911T/E. With power and torque increase, the 2.4-litre cars also got a newer, stronger transmission, identified by its Porsche type number 915. Derived from the transmission in the 908 race car, the 915 did away with the 901 transmission's "dog-leg" style first gear arrangement, opting for a traditional H pattern with first gear up to the left, second gear underneath first, etc. The 911 RS was developed to meet motorsport homologation requirements. Compared to a standard 911S, the Carrera 2.7 RS had a larger engine (2,687 cc) developing 210 hp with Bosch (Kugelfischer) mechanical fuel injection, revised and stiffened suspension, a "ducktail" rear spoiler, larger brakes, wider rear wheels and rear fenders, to fit 185/70VR15 & 215/60VR15 Pirelli Cinturato CN36 tyres. In RS Touring form it weighed 1,075 kg, in Sport Lightweight form it was about 100 kg lighter, the saving coming from thin gauge steel used for parts of the body shell and also the use of thinner glass.  The 911 ST was produced in small numbers for racing (the production run for the ST lasted from 1970 to 1971). The cars were available with engines of either 1,987 cc (2.0 L) or 2,404 cc (2.4 L) displacement, having a power output of 270 hp at 8,000 rpm. Weight was down to 960 kg.

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