Under the hood, the Audi TT landed with a four-cylinder 1.8-liter engine as a base, an optional turbocharged mill or a naturally aspirated six-cylinder Volkswagen VR6. That gave the Audi TT either 178 horsepower, 222 hp, or 247 hp with the V6. A manual transmission was initially available, and a quattro-branded Haldex all-wheel-drive system was optional. The V6 came with a quattro system as standard, and in 2006 a six-speed dual-clutch transmission was introduced along with stiffer suspension. The Audi TT was also the first car to feature Volkswagen Group’s Turbocharged Direct Injection (TDI) Diesel engines.
In 2005, the TT got its first limited edition. The Audi TT quattro Sport (Audi TT Club Sport in Europe) used the 1.8-liter turbocharged engine with an upgrade to 237 hp and a weight reduction of 165 lbs. Weight was dropped by removing the spare wheel, harmonic damper, and rear seats. Lighter Recaro front seats were fitted as well. The battery was moved to maintain balance, and it came with a two-tone paint scheme, exclusive 15-spoke, 18-inch wheels, and the body kit from the V6 model.
