The Audi TT quattro sport concept show car - Four-cylinder 2.0 TFSI engine with 420 hp - Impressive 210 hp per liter of displacement - Prof. Dr. Ulrich Hackenberg: “An extreme driving machine for the motorsports enthusiasts among our customers” Audi to present a truly special show car at the Geneva Motor Show. The Audi TT quattro sport concept embodies the dynamic potential of the new Audi TT in its purest form. Its two-liter TFSI supplies 309…