The first generation of the Porsche 911 begins in late 1964 and goes through 1968. The "base" model was an instant hit. During this period, Porsche would make continuous improvements and tweaks to the body, to its short wheelbase (SWB) chassis, and to its 2.0 liter flat six engine. Model year 1968 would be the last for the early 911, a transition that would begin with the introduction of the higher output 911S in 1967, followed by the 911L and a new entry level 911T in 1968, and finally, the 911E in 1969. The base 911 was available as both a Coupe and Targa (starting in '67).