The Porsche 917 is a racecar that gave Porsche its first overall wins at the 24 Hours of Le Mans in 1970 and 1971. Powered by the Type 912 flat-12 engine of 4.5, 4.9, or 5 litres, the 917/30 variant was capable of a 0-62 mph (100 km/h) time of 2.3 seconds, 0–124 mph (200 km/h) in 5.3 seconds, and a top speed of over 240 mph (390 km/h).
There are 6 variants of the 917. The original version had a long tail(917LH), but had considerable handling problems at high speed. The Gulf team had then experimented with a shorter tail, and solved the handling problems at the expense of some top speed Porcshe adopted these changes into the 917K. These versions produced around 620 bhp.
There is also the "Pink Pig" version, modified 917K with the 908 rear spoilers and the Turbo'ed spyder 917/10 /20 /30's. In the 1973 Can-Am series, the turbocharged version Porsche 917/30 developed over 1,100 bhp (820 kW), and as much as 1,580 bhp (1,180 kW) in qualifying tune.
The 917 is one of the most iconic sports racing cars of all time, largely for its high speeds and high power outputs, and was made into a movie star by Steve McQueen in his 1971 film Le Mans.
2009 marked the 40th anniversary of the 917, and Porsche held a special birthday celebration at the Goodwood Festival of Speed (3–5 July).
Source: Wikipedia, 2011