Some see rules and regulations as restrictive, something to hinder performance. The engineers at Audi look at rules and see them as an opportunity to innovate. Take the 2011 #2 Audi Sport North America R18 TDI, Audi’s 2011 LMP1 competitor in the 2011 24 Hours of Le Mans. Thanks to a host of rules changes between 2010 and 2011, here is a car that could scarcely be more different from its predecessor. Unlike the R15 of old, the R18 is a closed cockpit LMP1 sports car, the first fielded by Audi in more than 10 years. The R18 is light (thanks to copious amounts of carbon fiber construction) and puts a heavy premium on aerodynamic efficiency, and it’s powered by a 3.7 liter V6 TDI engine, featuring the use of a single turbo (a big change from the twin turbo V10s and V12s from previous years). Despite all of those changes, the R18 manages to have one thing in common with its predecessors: a penchant for victory, as the R18 managed top overall honors during the 2011 24 Hours of Le Mans.