Officially, the fastest production car ever built was the Bugatti Veyron Super Sport. With a top speed of 267.9mph, it's certainly no slouch. However, less well-known is the unofficial world record holder – the Hennessey Venom GT.
The Venom GT was recorded as having a top speed of 270.5mph, but as it only achieved this in one direction it was never officially recorded as a world record. However, it seems Hennessey is coming back for another crack at the top spot, as teaser images suggest that its new Venom F5 may have a top speed of 300mph.