The TT blends the original Bauhaus styling with Audi's current modern design theme and advanced technology. The coupes spaceframe is 69% aluminum and 31% steel (roadster = 58/42%), with most of the steel in the rear to offset the weight of the engine and better balance the car. All TT's are powered by a 200-hp turbocharged direct-injection 2.0-liter four-cylinder with a six-speed automatic S-tronic as the only transmission choice with this engine. The all-wheel drive version can also be had with a 250-hp 3.2-liter V6 with the choice of a six-speed manual or a six-speed S-tronic transmission. Safety features include front, side and knee airbags, run-flat tires with pressure monitoring and 4-wheel anti-lock brakes and stability control. Changes for 2009 include the availability of the 2.0T engine with the quattro AWD system as well as new packaging of different trim levels.