By far, the most spectacular Audi Sport performance parts are the Aero kits, which were developed in the Audi wind tunnel. For the R8 and the TT they add clear-cut highlights on the front air inlets, the side sills, and the diffuser, substantially improving downforce. On the R8 the downforce is 250 kg at 330 km/h: an increase of over 100 kg. At 150 km/h, the effect is even more pronounced — doubling to 52 kg. There is also a splitter and flics at the front, as well as a large fixed rear wing. An engine hood with a large air vent is also available for the TT. All parts are made of carbon fibrereinforced polymer (CFRP) or a combination of CFRP and plastic for the TT.