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The 2004 Audi B5 S4 has long been a favorite among car enthusiasts for its balance of performance and luxury. With a twin-turbocharged V6 engine, it offers a thrilling driving experience. However, many owners seek to unlock even more power, and one of the most popular upgrades is the APR Stage 3 upgrade. This article explores the real-world results of a 2004 B5 S4 that achieved an impressive 350 horsepower after undergoing this modification.
Understanding the APR Stage 3 Upgrade
The APR Stage 3 upgrade is a comprehensive performance package designed to significantly enhance the power output of the B5 S4. This upgrade typically includes a larger turbocharger, upgraded intercooler, high-flow fuel injectors, and a performance tune. The goal is to improve airflow and fuel delivery, allowing the engine to produce more power while maintaining reliability.
Key Components of the Upgrade
- Larger Turbocharger: Increases airflow and boosts power.
- Upgraded Intercooler: Reduces intake temperatures for better performance.
- High-Flow Fuel Injectors: Ensure adequate fuel delivery to match increased airflow.
- Performance Tune: Optimizes engine parameters for maximum output.
Real-World Performance Metrics
After the APR Stage 3 upgrade, the 2004 B5 S4 was put to the test on a dynamometer. The results were impressive, showcasing the effectiveness of the modifications. The vehicle achieved a peak horsepower of 350, a significant increase from its stock rating of around 250 horsepower.
Torque Figures
In addition to horsepower, torque is a crucial metric for performance vehicles. The upgraded B5 S4 recorded torque figures of approximately 400 lb-ft, providing excellent acceleration and responsiveness. This increase in torque enhances the driving experience, making the vehicle feel more powerful across the entire RPM range.
Driving Experience After Upgrade
With the APR Stage 3 upgrade, the driving experience of the 2004 B5 S4 transforms dramatically. The vehicle feels more alive, with quicker throttle response and a more aggressive power delivery. Drivers report a noticeable difference in acceleration, especially during overtaking maneuvers and spirited driving.
Handling and Stability
In addition to power, handling is crucial for performance cars. The B5 S4, equipped with upgraded suspension components, maintains excellent stability during high-speed cornering. The combination of power and handling creates a well-rounded performance package that appeals to driving enthusiasts.
Considerations for Potential Buyers
For those considering purchasing a 2004 B5 S4 with the APR Stage 3 upgrade, there are several factors to keep in mind. While the increase in power and performance is enticing, potential buyers should also consider the vehicle’s maintenance history and any modifications that may have been made.
Maintenance and Reliability
Upgraded vehicles often require more attention than their stock counterparts. It’s essential to ensure that the previous owner maintained the vehicle properly and used high-quality parts during the upgrade process. Regular maintenance and proper tuning are vital to keeping the vehicle running smoothly and reliably.
Conclusion
The 2004 B5 S4, when equipped with the APR Stage 3 upgrade, achieves remarkable performance figures, reaching 350 horsepower and 400 lb-ft of torque. This upgrade not only enhances power but also improves the overall driving experience, making it a desirable option for enthusiasts. However, prospective buyers should approach with caution, ensuring that the vehicle has been well-maintained to enjoy the full benefits of this performance enhancement.