Bugatti Veyron
For Volkswagen, it was a huge gamble to even approach building something such as Bugatti Veyron. The success of this car depended on a huge number of parts, which all had to be custom made in-house. To paint the picture of how complicated this car is, it has the following: Two intercoolers, three radiators, a separate oil cooler for transmission, engine oil and differentials, and these are just a tip of the iceberg. No wonder Volkswagen loses money every time they make one of these.