When an auto company goes racing, they are always quick to draw correlations with the vehicle on the track influencing the product for the street. Sometimes it seems to be purely a reach of reasoning when an stock version of an automobile differs so greatly from the race version. NASCAR is arguably one example of this when a front-wheel drive Ford Fusion powered by four-cylinder or six-cylinder powerplants is represented by a rear-wheel drive, V-8-powered stock car. Audi often touts the technology residing in their prototype sports car as transitioning to the production cars but the R18 e-tron quattro racing in the FIA World Endurance Challenge incorporates far-out mechanics such as a hybrid electric turbocharger . Thankfully for those motorsport purists who want to see race cars resemble their showroom stock counterparts, the GT classes of sports car racing can be trusted in providing a faithful mix of street and track perform...