Audis had a reputation as rough-and-tumble machines, but the `93 Audi 90S represents a major change. This was a tame machine, as in ``cozy`` and``comfortable.`` The perception of riding in and on a block of concrete isgone. The 2.8-liter V-6 delivered ample power, and the short-throw five-speed manual transmission was smooth. Anti-lock brakes and a driver-side air bag arestandard; a passenger-side bag is coming within a couple years. If Audi keeps turning out cars with the performance of the 90 and the 100, the onlyunexpected acceleration will be in sales.