It was first available with a 1.8 litre inline four cylinder 20-valve turbocharged engine, with either 180 PS (132 kW; 178 bhp) or 225 PS (165 kW; 222 bhp). The engines share the same basic design but the 225 PS version features a larger turbocharger, an additional intercooler on the driver’s side, forged connecting rods, a dual exhaust, and a few other internals designed to accommodate the increase in turbo boost from roughly 10 psi peak to 15. Haldex Traction enabled four wheel drive, ‘branded’ as “quattro” was optional on the 180 PS (132 kW; 178 bhp) engine, and standard on the more powerful version.

TT was first shown as a concept car at the 1995 Frankfurt Motor Show. The design is credited to J Mays and Freeman Thomas,with Martin Smith and Romulus Rost contributing to the award winning interior design. A previously unused laser welding adaptation which enabled seamless design features on the first-generation TT also delayed its introduction.

Audi did not initially offer an automatic transmission option for the TT. A Direct-Shift Gearbox (DSG) became available, the first for a production car, in 2003.

A wide range of engines were available to European customers, between 1.6 and 2.8 litres for petrol engines, and a 1.9 L diesel engine available with Volkswagen Group’s VE technology, capable of achieving a 90 PS (66 kW; 89 bhp) or 110 PS (81 kW; 108 bhp), although Audi’s 2.8 L V6, carried over from the old 80/90 was the only engine option in North America until 1997.

The previous KKK K03 turbocharger, although fundamentally unchanged, did receive some revisions on the turbine side to prevent cracking due to heat.[citation needed] The 12-valve V6 was replaced by the 30-valve unit which had been available in Europe for two years.

In 1999, Audi debuted an even higher performance RennSport model, the RS4 Avant, like its predecessor RS2, available only in the Avant bodystyle.

Besides the introduction of a 2.8 L 30-valve V6 engine (replacing the 2.8 L 12-valve), the most important additions to the range were the 2.5 L V6 Turbocharged Direct Injection (TDI) diesel engine with 150 PS (110 kW; 148 bhp) and standard quattro, and a six-speed manual gearbox, as well the new high-performance Audi S4, now part of the A4 lineup (the previous S4 had been an Audi 100). New rear lights, headlights, door handles, and other minor exterior/interior changes rounded out the cosmetic updates.

With five valves per cylinder, based on the unit Audi Sport had developed for their Supertouring race car. A turbocharged version produced 150 PS (110 kW; 148 bhp) and 210 newton metres (155 ft·lbf) torque. This technology was added to the V6 family of engines in 1996, starting with the 2.8 L V6 30V, which now produced 193 PS (142 kW; 190 bhp).

The A4 was initially introduced as a four-door saloon/sedan; the Avant (estate/wagon) arrived a year later.
A wide range of engines were available to European customers, between 1.6 and 2.8 litres for petrol engines, and a 1.9 L diesel engine available with Volkswagen Group’s VE technology, capable of achieving a 90 PS (66 kW; 89 bhp) or 110 PS (81 kW; 108 bhp), although Audi’s 2.8 L V6, carried over from the old 80/90 was the only engine option in North America until 1997.

The initial generation A4 succeeded the four previous generations of the Audi 80. And just like its Audi 80 predecessor, the Audi A4 automobile layout consists of a longitudinally orientated engine at the front, with transaxle-type transmissions mounted immediately to the rear of the engine, again, orientated longitudinally. Drive output is transmitted to either the front wheels, or, utilising Audi’s ‘trademark’ quattro permanent four-wheel drive system via a Torsen centre differential.

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