The Porsche 911S was the top of the line 911 model for 1972 and through 1973 until the Carrera RS 2.7 was introduced. The 911S sat above the contemporaneous 2.4L 911T and the 2.4L 911E. As with the T and E variants, Porsche would upgrade the 911S to a new, larger 2,341 cc (2.3 L) engine, commonly known as the "2.4 L" engine. The engine version on the 911S, Type 911/53, was rated at 190 hp and featured mechanical fuel injection (the version with Sportomatic was Type 911/63). With the power and torque increase, the 2.4-liter cars also got the newer and stronger transmission, identified as the 915 gearbox. It was produced as both a 2.4L 911S Coupe and a 2.4L 911S Targa. Vehicles from this period that have undergone significant modifications can be found in the 911S Custom market. The 2.4 liter 911S was replaced by the 2.7 liter 911S for model year 1974.