at European Volkswagen dealerships. For 1973 the discontinued 914/6 was replaced in the lineup by a variant powered by a new 2.0 L, fuel-injected version of Volkswagen's Type 4 engine. For 1974, the 1.7 L engine was replaced by an 1.8 L, and the new Bosch L-Jetronic fuel injection system was added to American units to help with emissions control. Model year changes Over the seven model years, Porsche made a number of changes to the 914. Some of these changes were cosmetic and others were in response to changing crash protection standards. From 1970 to 1972, the 914 was offered with chrome or painted bumpers. In early 1970, rear bumpers were produced with a straight crease on either side of the license plate indent. Between 1970 and 1972, both front and rear bumpers were smooth without bumper guards. In 1973, bumper guards were added to the front of the car. In 1974, guards were also added to the rear bumper. In 1975 and 1976, the chrome or painted bumpers were replaced with heavy, rubber-covered units which actually made the cars more stable at high speeds. The headlight surrounds were white from the first 914s to mid-production of 73 and subsequently black. Cars produced up to early 1972 had a fixed passenger seat and a removable passenger footrest. Later cars featured a movable passenger seat. Other interior differences included changing vinyl designs, gauge appearance, and air vent configurations in the dash. The most significant performance upgrade during the vehicle's lifespan was the introduction of anti-roll bars, significantly improving the handling, and a change from the "tail shifter" to the "side shifter" gearbox for 1973 to 1976, improving the otherwise vague long linkage. Technical summaries Technical specifications of the standard versions The Porsche 914 was produced from 1969 to 1976 in the following models: 914 road car timeline Chassis numbers Concept cars, prototypes, and factory specials Porsche 914/6 GT, 914/6 R On 1 March 1970 the 914/6 was homologated by the Fédération Internationale de l'Automobile (FIA) for Group 4, Special Grand Touring cars. That same month two cars were sent to the Targa Florio for testing, not as competitors. These were the first two 914/6 GT cars built. Externally the cars were distinguished by squared fender flares that were the full depth permitted by FIA rules. The chassis was reinforced with three welded plates on each side. For rally applications a