There are seven production road cars in GT6 that feature the name "quattro" but only one can be the original. This car enjoyed a total production length of almost 11 years, going on sale in late 1980, with the final car rolling off the line in May 1991. The transmission was included within the central differential, which meant it did not allow management of torque distribution between the front and rear wheels. Interesting!
2.1L
199 hp / 6,000 rpm
213 ft-lb / 3,500 rpm
1,290 kg (2,844 lbs)
400 PP
^ Maximum speed achieved - 120 mph
Screwed up the corner near the end right before the tunnel, slowed down too much and tried to gas my way out but the understeer got me and I went "out of bounds" but did not get DQ'd. Still a 1:30 car.
Cars within +/- 0.500 seconds:
1:30.397 - 387 - Toyota Sprinter Trueno BZ-R '98
1:30.410 - 393 - Nissan Skyline HT 2000 Turbo RS (R30) '83
1:30.424 - 409 - Alfa Romeo Brera Sky Window 3.2 JTS Q4 '06
1:30.456 - 408 - Mitsubishi Galant 2.0 DOHC Turbo VR-4 '89
1:30.471 - 395 - Toyota Celica SS-II (ZZT231) '99
1:30.477 - 389 - Mini Cooper S '02
1:30.502 - 383 - Honda CR-X SiR '90
1:30.510 - 411 - Toyota Celica GT-Four RC (ST185) '91
1:30.565 - 389 - Nissan Primera 20V '01
1:30.574 - 371 - MG MGF '97
1:30.578 - 404 - Volkswagen New Beetle RSi '00
1:30.599 - 391 - Mini Cooper S '05
1:30.600 - 383 - Honda Civic SiR-II (EG) '95
1:30.622 - 392 - Nissan Silvia K's Dia Selection (S13) '90
1:30.703 - 391 - Mazda Roadster RS (NC) '07
1:30.706 - 382 - Mitsubishi FTO GR '94
1:30.726 - 408 - Mitsubishi Airtrek Turbo-R '02
1:30.728 - 401 - Alfa Romeo GTV 3.0 V6 24V '01
1:30.805 - 400 - Audi Quattro '82
1:30.822 - 407 - Ford Taurus SHO '98
1:30.822 - 402 - Mercedes-Benz 300 SL Coupé '54
1:30.843 - 390 - Peugeot 207 GTi '07
1:30.887 - 376 - Toyota MR2 Spyder '99
1:30.908 - 398 - Toyota Celica SS-II (ST202) '97
1:30.911 - 386 - Ford Focus ST170 '03
1:30.913 - 383 - Mazda MX-5 1800 RS (NB, J) '00
1:30.960 - 383 - Hyundai Tiburon GT '01
1:31.108 - 398 - Mitsubishi GTO SR '95
1:31.112 - 387 - BMW 2002 Turbo '73
1:31.133 - 395 - Mini Cooper S '07
1:31.156 - 399 - Mitsubishi Eclipse Spyder GTS '03
Looking at other cars from the 1980-1991 period on this list, there's the Nissan R30 Skyline Turbo RS and S13 Silvia, Honda CRX, Toyota Celica ST185, and Mitsubishi Galant VR-4.
4WD cars on the list include the Alfa Brera, Mitsubishi Airtrek, Galant VR-4, GTO, and the Toyota Celica ST185.
I'd say the Audi does pretty well for itself and can keep up with modern cars like the Alfa Brera '06 and the Mazda Roadster, Peugeot 207 GTi, and Mini Cooper '07s. Audi's own TT 1.8T '00 is less than a second quicker. Definite sleeper.