10. Audi S4 (B5)
The B5 Audi S4 stunned the market with its potent 2.7-liter twin-turbo V6 engine, a powerplant that would become legendary among enthusiasts.
This engine didn’t just power the S4—it also formed the basis for the first Audi RS4, helping set the stage for future super sedans from the brand.
The B5 S4’s performance roots and engineering excellence made it a true sleeper, hiding supercar influence under an executive exterior.
Car and Driver