Audi S4 B7
2005-2008
The B7 S4 embodied Audi's philosophy of understated performance, combining a free-revving V8 with sophisticated all-wheel drive and luxurious appointments. It represented the last of the naturally aspirated S4s, offering linear power delivery and a characterful soundtrack that modern turbo engines can't match.
Quick Take
The B7 S4 marked Audi's transition from turbo six-cylinder to naturally aspirated V8 power, delivering a sophisticated blend of performance and luxury. Known for its rev-happy 4.2L V8 and refined Quattro all-wheel drive system, it offered genuine sports sedan capability with everyday usability.
Best For
Key Strength
Supercharged V6 Character
Watch For
Carbon Buildup Nightmare
The Story
Heritage & Legacy
Following the legendary B5 S4's twin-turbo V6, the B7 generation marked a significant shift to naturally aspirated V8 power shared with the RS4. This engine choice reflected Audi's desire for more linear power delivery and reliability while maintaining the S4's position as the thinking person's sports sedan.
Design Philosophy
Audi's B7 S4 design emphasized subtle aggression and premium materials, featuring flared wheel arches, distinctive side gills, and quad exhaust outlets. The interior showcased high-quality leather, aluminum trim, and sport seats that balanced support with long-distance comfort, embodying German luxury restraint.
The Driving Experience
Engine Character
The 4.2L V8 delivers smooth, linear power with a willingness to rev that rewards enthusiastic driving. Power builds progressively from 3,000 RPM onward, accompanied by a sophisticated exhaust note that grows more aggressive as revs climb, creating an engaging and refined driving experience.
Chassis Dynamics
The B7 S4's chassis strikes an excellent balance between sport and comfort, with well-controlled body motions and precise steering feel. Quattro AWD provides exceptional traction and stability, while the suspension delivers composed handling without sacrificing ride quality on long journeys.
Sound Signature
The naturally aspirated V8 produces a refined rumble at idle that transforms into a purposeful growl under acceleration. The exhaust note is sophisticated rather than brash, perfectly matching the car's understated character.
Strengths & Tradeoffs
Defining Strengths
The 4.2L supercharged V6 delivers power in a uniquely smooth, linear fashion that sets it apart from turbocharged alternatives. The supercharger whine adds character while providing immediate throttle response with no lag.
Audi's legendary Quattro AWD system provides exceptional traction in all conditions, making the S4 incredibly confidence-inspiring. The system's ability to send power where needed makes it a year-round performance car.
Honest Tradeoffs
The direct-injection system causes severe carbon buildup on intake valves, requiring expensive walnut blasting every 40-60k miles. This is not an 'if' but a 'when' maintenance item that can cost $800-1200.
The B7 generation is notorious for electrical issues including window regulators, coil packs, and various sensors failing regularly. These problems compound with age and can make ownership frustrating and expensive.
Ideal Owner
Perfect for enthusiasts who appreciate naturally aspirated engines and want a refined daily driver with genuine performance capability. Appeals to those seeking German engineering excellence without the maintenance complexity of forced induction.