The 2003 Audi S4, representing the second generation of the iconic S4 series (B6), ushered in a new era of high-performance luxury sedans by pairing innovative German engineering with Audi’s signature Quattro all-wheel drive.
Engine and Performance Upgrades
A key highlight of the 2003 S4 was the transition from the previous twin-turbocharged 2.7-liter V6 of the B5 generation to a naturally aspirated 4.2-liter V8 DOHC powerplant, derived from the S6’s engine lineage. This all-aluminum V8 was specially modified for the S4 platform, with Audi engineers reducing engine length and revising the drive belt configuration to fit the compact A4 chassis. Capable of producing a robust 344 horsepower and 409.6 Nm of torque, the V8 allowed the S4 to outperform the more exclusive S6 in raw acceleration.
Drivers could choose between a 6-speed manual transmission, prized for its direct engagement, or a 6-speed automatic for relaxed cruising. Thanks to its potent power-to-weight ratio of 4.80 kg per horsepower, the S4 launched from 0 to 100 km/h in just 5.6 seconds, affirming its credentials as a true sports sedan.
Handling, Comfort, and Engineering
Despite the considerable increase in curb weight—1.7 tons for the sedan and approximately 1.8 tons for the Avant wagon—the 2003 S4 remained agile and responsive. Audi’s sophisticated Quattro AWD system ensured superb grip in all conditions, seamlessly translating V8 torque to the road. The car’s Servotronic variable power steering adjusted inputs depending on speed, optimizing handling for agility in city traffic and stability on winding roads or highways.
This generation of S4 also featured a sport-tuned suspension system, larger brakes, and a reinforced chassis to accommodate the engine’s output and maintain stability. These enhancements resulted in precise steering and confident cornering, making the S4 one of the best-balanced performance cars of its class.
Interior Features and Practicality
The S4’s cabin married sportiness with luxury, featuring Alcantara and leather sport seats, aluminum trim accents, and full climate control. Audi’s attention to detail carried through with advanced safety systems and a spacious layout for both sedan and Avant models. The increased weight—a consequence of additional luxury and performance hardware—brought the S4’s mass in line with flagship luxury cars like the Mercedes S-Class, yet without compromising its nimble character thanks to engineering refinements.
Model Legacy
The 2003 Audi S4 B6 remains a favorite among enthusiasts, lauded for its naturally aspirated V8, robust Quattro system, and classic understated German styling. It set the benchmark for both performance and daily usability, blending raw power with precision handling and comfort.
