The Audi S4 (B7) is a sports saloon based on the B7 Audi A4. It is priced below the Audi RS 4 and is the second most powerful car in the A4 series. The 4.2L FSI V8 produces 340 bhp and 302 lb-ft of torque. Top speed is electronically limited at 155 mph (250 km/h). The B7 S4 is the second and the last model in the S4 range to be fitted with a V8.