Injen Intercooler Charge Piping Upgrade Kit for 2021 Audi S4

CARB Compliance / Exemption Warning: If you live in California and your application for this product is not CARB Compliant / Exempt, then you cannot purchase it for public highway or street use (in that case it could only be used for formally sanctioned race use on a racing vehicle that may never be used on a public highway or street). If your application is not CARB Compliant / Exempt and you're shipping to California, our system will let you know on the final checkout page.


The Injen Intercooler Piping Upgrade Kit is designed to be free-flowing and provide more airflow compared to your factory intercooler piping. This kit is made from mandrel-bent lightweight aluminum tubes, and has been engineered to reduce turbocharged air pressure loss as well as increase horsepower. Replaces only key sections of the intercooler piping. Comes with complete installation hardware and instructions.

Key Features:

• Easy bolt-on installation, no modifications needed.
• Larger and smoother than OEM piping for better airflow, increased throttle response, and decreased turbo lag.
• Made from mandrel-bent T6-6061 aluminum.
• Precision CNC-machined and TIG-welded sensor flanges included when applicable.