In late 1955 the first regular production Carrera Speedster hit the market as the 1500GS. This used a detuned version of the Porsche 550 engine which was fitted until March of 1958. Like the coupes, these cars used the potent Type 547/1 Flat-4 engine that had a 100 capable bhp.
Porsche priced the 1500GS almost 30% more than the standard push-rod Carrera at 17,500 dm compared to the 1600 Super at 13,000. This increased cost was directly related to the engine which was much more complex with four separate camshafts.
Later into production Porsche began fitting the Speedster with options to go racing. In 1957 the first GT engines were available with 10 additional horsepower. These were generally fitted with the 80-liter fuel tank and 60mm front racing brakes.
By 1958 the racing program was taken a step further with optional aluminum panels such as the doors, trunk and hood. Many of the final Carrera Speedsters were fitted with the GT package in 1958.