Is this a facelifted or special edition MKIII 8S Audi TT-RS model? Maybe. It seems more likely Audi is testing some Audi Sport performance parts which include new aerodynamic pieces. That explains the different wing as well as the dive planes.

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You can also pick up on carbon fiber side skirts. Beyond the aerodynamics pieces it is possible Audi has some revised suspension components.

The car is not camouflaged so Audi is not trying to hide anything here.

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