Although Audi had launched the idea of the super wagon with the RS2, by the late 1990s they didn’t have anything near as impressive. Sure, the S4 Avant was quick, but with 250 horsepower it was substantially less powerful than the 315 horsepower RS2 and the 322 horsepower S6 Plus. Something needed to be done to live up to the reputation of quattro GmbH, and that something involved Cosworth. Taking the basic twin turbocharged V6 from the B5 S4, Cosworth Technologies thoroughly rebuilt the motor. Now dubbed the ASJ (later AZR), the power went up 50% to 375 horsepower with an equally impressive 325 lb.ft of torque. To match the performance of the motor, quattro GmbH introduced new bodywork that channeled some of the trends set by the RS2; larger vents on the front bumper, wider sills, and larger brakes and wheels. The result was a package that lived up to the “RS” moniker with sub 5-second 0-60 runs, a 160 m.p.h. top speed, but also the brakes and grip to compete with contemporary sports cars. It may not have had the mystique of the RS2 without the name Porsche, but it was a package that was just as desirable then as it is today:
