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The Akrapovic exhaust system has gained significant attention among automotive enthusiasts, particularly for its impact on the performance and sound of the S55 engine. This article delves into the dyno-tested results of the Akrapovic exhaust, showcasing how it enhances power output and acoustic characteristics.
Understanding the S55 Engine
The S55 engine, a high-performance inline-six turbocharged unit, powers various BMW models, including the M3 and M4. Known for its robust performance, the S55 benefits from aftermarket modifications that can further unlock its potential.
What is the Akrapovic Exhaust?
The Akrapovic exhaust system is renowned for its lightweight construction and advanced materials, primarily titanium and carbon fiber. This design not only reduces weight but also enhances durability and performance.
Key Features of the Akrapovic Exhaust
- High-quality titanium and carbon fiber construction
- Optimized flow dynamics for improved exhaust efficiency
- Enhanced sound profile for a sportier driving experience
- Custom fitment for S55 models
Dyno Testing Methodology
To evaluate the performance benefits of the Akrapovic exhaust, a series of dyno tests were conducted. The tests compared the stock exhaust system with the Akrapovic system under controlled conditions.
Testing Conditions
- Temperature: 70°F (21°C)
- Humidity: 50%
- Fuel: 93 octane premium gasoline
- Vehicle: BMW M4 equipped with S55 engine
Results Overview
The results from the dyno tests indicated a noticeable improvement in both horsepower and torque with the Akrapovic exhaust installed. The following sections detail the findings.
Power Gains
The Akrapovic exhaust system demonstrated significant power gains across the RPM range. The following figures summarize the horsepower and torque improvements:
- Peak horsepower increased by 15 hp at 6,500 RPM
- Peak torque increased by 20 lb-ft at 4,500 RPM
- Improved throttle response and acceleration
Sound Improvements
In addition to power gains, the Akrapovic exhaust system enhances the auditory experience of the S55 engine. The sound profile is characterized by a deeper, more aggressive tone, which is a significant upgrade over the stock exhaust.
Sound Characteristics
- Deeper bass notes at low RPMs
- Aggressive growl during acceleration
- Reduced drone at cruising speeds
- Sporty sound that enhances the driving experience
Installation Process
Installing the Akrapovic exhaust system on the S55 is a straightforward process, though it is recommended to have it performed by a professional to ensure optimal fitment and performance.
Steps for Installation
- Lift the vehicle and secure it on jack stands
- Remove the stock exhaust system
- Install the Akrapovic exhaust components, following the provided instructions
- Check for leaks and secure all connections
- Lower the vehicle and perform a sound check
Conclusion
The Akrapovic exhaust system offers substantial improvements in both power and sound for the S55 engine. With its lightweight design and superior materials, it not only enhances performance but also transforms the driving experience. For enthusiasts looking to maximize their S55’s potential, the Akrapovic exhaust is a worthy investment.