Enhance your vehicle's performance with the K&N 57S-4900 Performance Airbox—a high-performance upgrade engineered to deliver increased power and acceleration. Designed specifically to replace the restrictive factory air filter and airbox assembly, this kit maximizes engine breathing by smoothing and streamlining the intake airflow. Ideal for enthusiasts driving vehicles like the Opel Astra H with its 2.0L engine, the K&N Performance Intake Kit helps boost horsepower and torque throughout the RPM range.

Key Features & Benefits

• Increased horsepower and torque thanks to improved airflow
• Custom high-flow air filter featuring a reusable design—capable of lasting up to 100,000 miles under optimal conditions
• Smooth, streamlined airflow that guarantees a performance boost
• Removable lid on the fully enclosed, injection-molded airbox for easy cleaning
• Engineered to maximize engine performance by optimizing air intake space for a true 2.0L performance upgrade

Installation & Maintenance

• Straightforward installation that fits into the existing air box space using commonly available tools (typically completed in under 90 minutes)
• Comes with comprehensive, step-by-step installation instructions. For detailed guidance, refer to the Installation Instructions
• Routine maintenance guidelines ensure the air filter’s longevity and optimal performance

Warranty & Compliance

Enjoy peace of mind with the protection of K&N’s Million Mile Limited Warranty, which guarantees durability and reliability for the life of your vehicle. Several configurations meet the latest TUV emissions and sound regulations, offering both performance and legal assurance.

Discover more high-performance solutions in our Air Intake Systems collection.