The production model (internal designation Typ 8N) was launched as a Coupé in September 1998, followed by a Roadster in August 1999. It is based on the Volkswagen Group A4 (PQ34) platform as used for the Volkswagen Golf Mk4, the original Audi A3, the koda Octavia, and others. The styling differed little from the concept, except for slightly reprofiled bumpers, and the addition of a rear quarterlight windows behind the doors. Factory production commenced October 1998.
Mechanically, the TT shares an identical powertrain layout as its related Volkswagen Group platform-mates. The TT uses a transversely mounted internal combustion engine, with either front-wheel drive, or 'quattro' on-demand four-wheel drive. It was first available with a 1.8 litre inline four cylinder 20-valve turbocharged engine in two states of DIN-rated power outputs; 180 PS (132 kW; 178 hp) and 225 PS (165 kW; 222 hp). The engines share the same fundamental design, but the 225 PS version features a larger K04 turbocharger, an additional intercooler on the right side (complementing the existing left-side intercooler), forged connecting rods, a dual tailpipe exhaust, and a few other internals - designed to accommodate the increase in turbo boost, from roughly 10 pounds per square inch (0.7 bar) peak, to 15 pounds per square inch (1.0 bar). Haldex Traction enabled four wheel drive, 'branded' as quattro was optional on the 180 engine, and standard on the more powerful 225 version.
The original four cylinder engine range was complemented with a 250 metric horsepower (184 kW; 247 hp) 3.2 litre VR6 engine in early 2003, which comes as standard with the quattro four-wheel drive system. In July 2003, a new six-speed dual clutch transmission - dubbed the Direct-Shift Gearbox, which improves acceleration through much-reduced shift times, was offered, along with a stiffer suspension.

Engine(s)
1.8 L I4 20v Turbo,
3.2 L VR6
Transmission(s)
5-speed manual
(all models FWD),
6-speed manual
(all modells 4WD),
6-speed DSG

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