Audi has furtively unveiled its plans to revive the company’s rich five-cylinder racing heritage.Towards the end of each motorsport season, manufacturers can be seen entering cars as test prototypes for the following season. TT RS - born to raceAt the last two rounds of this year’s Endurance Championship, set to be hosted at the fabled Nürburgring, Audi will run a rather special car prepared by siblings Martin and Nicolas Raeder. The car in question is a five-cylinder TT RS endurance racer, entered to campaign in class SP4T. Featuring all the required endurance racing styling paraphernalia (including a table-sized rear wing and really bright LEDs), this SP4T racer effortlessly makes the transition from TT RS road car to circuit machine. Running an evolution of the series production car’s 2.5l five-cylinder FSI turbo engine, the TT RS endurance racer gains most of its trick aerodynamics and suspension bits from Audi’s R8 LMS racer.For those racing fans with fond memories of the company’s IMSA racers of the late 1980s, the return of five-cylinder turbocharged power will be welcomed. The Raeder prepared TT RS will be used to finalise specification for a customer car programme (similar to the R8 LMS) next year.