Audi is going bonkers! First it decided to continue making an evocative sounding five-cylinder motor in the new 2.5-litre TFSI mill. Then Audi gave it 400PS of max power and plonked it in the TT RS. Now the German automaker has found another application for the mad engine " the practical, sedan-bodied A3. The result is the Audi RS3 sedan which promises to be another crazy car wearing the Rennsport badges.