Ferdinand Alexander 'Butzi' Porsche is credited with the design of the Porsche 911, together with Erwin Komenda. Launched at the Frankfurt Auto Salon in 1962 as the 'Porsche 901' it was quickly renamed '911' after Peugeot claimed ownership of '901'. A 1991cc 6-cylinder boxer engine (from the 356) powered the new 911 and sales began in 1963. A cheaper 4-cylinder version was sold as the 'Porsche 912' from 1965-69. In 1965 an open Porsche 911 was announced with an integral rollbar that was finished in stainless steel; this was the Porsche 911 Targa, named after the Targa Florio race won by Porsche. Porsche produced a tuned 911 in 1966, the '911S' with upgraded chassis and brakes and new Fuchs alloy wheels. A '911L' was announced for the American market in 1968 with less tuned engine to comply with Federal emmission regulations. Porsche also introduced the lower priced 911T as a kind of 6-cylinder 912, and the 911E a higher performance 911. The 'B-series' took over in 1969 with a longer wheelbase but without changes to the body appearance. C-Series cars were introduced in 1970 with larger 2165cc engine, giving 125bhp for the 911T, 155bhp for the new 'einspritzung' 911E, and 180bhp for the 'Super' 911S. Aluminium panels helped to make the C-Series 911E and 911S lighter, and a special lightweight 911S was also offered. The D-Series cars from 1971 had galvanised floor panels, and in 1972 the Porsche 911 2.4 was given a 2341cc engine for the E-series. E-Series cars have a fuel filler flap on one front wing and an oil filler flap on the rear wing, but the F-series cars from 1972 moved the oil filler inside. A small chin spoiler was given to the 911S in 1972 and standard on all from 1973. Shock absorbing bumpers appeared in 1973 as did the 2681cc Carrera RS that gave a detuned 2.7litre engine to the G-series in 1974. The 911S was demoted beneath the hotter 911 Carrera and took the place of the 911E. H-Series 911s from 1975 got deeper spoilers, and the 911 Turbo made its first appearance with a 3-litre engine that in normal aspirated form found its way to the Carrera 3.0. There were no more 2.7 911s from 1978 as the range contracted to 911SC and 911 Turbo. At this point Porsche rolled out the 928 V8 car which was intended to replace the 911, but good sales of the 911SC kept the 911 in production. The first 911 cabriolet was launched in 1981. For the 911s 20th anniversary a Carrera with 3.2 engine and a Turbo, both available as coupe, cabriolet or Targa. In 1989 a new Porsche 911 designated as the '964' gave a 911 that was 85 percent new.