In 1999, Audi expanded the range with the introduction of more powerful versions: a 1.8 Turbo with 180 PS (132 kW)) and a 1.9 I4 TDI Diesel with pumpe-düse technology and variable geometry turbocharger. The four-wheel-drive A3 1.8T quattro used either the 150 hp (110 kW) or 180 PS (132 kW) engine and the same Haldex-based all-wheel drive system as the Audi S3 and the Audi TT. 1999 was also the year Audi was forced to bow to market demands and introduced a hastily-conceived five-door body that the company had not previously intended to produce.
In late 2000, the A3 range was revised with new headlights and rear light clusters, other minor cosmetic changes, an improved interior, and the introduction of a six-speed manual gearbox, on the 180 PS (178 hp/132 kW) 1.8 Turbo and the brand new 130 PS (96 kW) 1.9 TDI. Audi's ESP (Electronic Stability Programme) traction-control and brake force distribution computer became standard equipment. Although the Audi A3 was replaced in Europe during 2003, the first generation model continues to be sold in developing countries.
Source: Wikipedia Audi A3/S3 Article