Description
Designed specifically for the Audi 3.0T EA839 turbocharged V6, the Untd. Performance Catless Downpipe is engineered to significantly improve exhaust flow by eliminating the restrictive factory catalytic converter. The freer-flowing design helps reduce exhaust backpressure, improve turbocharger response, and deliver a deeper and more aggressive exhaust note.
Developed for the Audi B9 S4, B9 S5, and B9 SQ5, this catless downpipe is an ideal upgrade for enthusiasts looking to improve the performance potential of the EA839 platform while allowing the turbocharger to operate with reduced exhaust restriction.
Key Features
Catless Design – Maximum Exhaust Flow:
The Untd. Performance Catless Downpipe eliminates the restrictive factory catalytic converter, allowing exhaust gases to flow more freely from the EA839 turbocharger. The reduced restriction can help lower exhaust backpressure and improve overall turbocharger efficiency.
Improved Turbo Response & Performance:
The freer-flowing downpipe allows the EA839 turbocharger to expel exhaust gases more efficiently. When paired with an appropriate ECU calibration, the increased exhaust flow can help improve turbo response, throttle response, horsepower, and torque.
Aggressive 3.0T V6 Sound:
Unleash more of the character of Audi’s turbocharged V6. The catless design produces a louder, deeper, and more aggressive exhaust tone, while making turbo spool and exhaust notes more pronounced during acceleration.
Premium Stainless Steel Construction:
Manufactured from high-quality stainless steel and engineered to withstand the extreme temperatures and exhaust pressures generated by the EA839 engine. Precision-welded construction provides excellent durability for both street and performance applications.
Direct-Fit / Bolt-On Design:
Designed specifically for compatible Audi B9 S4, B9 S5, and B9 SQ5 3.0T EA839 applications, providing a direct replacement for the factory downpipe while maintaining compatibility with suitable OEM and aftermarket exhaust components.
Complete Installation Hardware Included:
The downpipe is supplied with installation hardware, including replacement gaskets and bolts, helping provide everything needed for a clean and secure installation. Using the supplied hardware helps ensure proper sealing and fitment during installation.
Tune Recommended / Required for Optimal Performance:
An ECU tune is strongly recommended and may be required when installing a catless downpipe. Proper calibration allows the EA839 engine and turbocharger to take full advantage of the increased exhaust flow while optimizing boost control, fueling, throttle response, and overall performance.
⚠️ Check Engine Light Warning
A Check Engine Light (CEL) may occur after installing this catless downpipe due to the removal of the factory catalytic converter and the resulting change in exhaust emissions readings.
A compatible ECU tune is recommended and may be required to properly calibrate the vehicle for the catless downpipe and address catalyst-efficiency-related fault codes. Tune requirements can vary depending on the vehicle, model year, ECU software, emissions equipment, and existing modifications.
For optimal performance, drivability, and compatibility, professional ECU tuning is recommended.
Why Upgrade?
The factory EA839 exhaust system incorporates a catalytic converter designed primarily for emissions control. While necessary for emissions reduction, the factory catalytic converter can create additional restriction in the exhaust system.
Replacing the factory downpipe with the Untd. Performance Catless Downpipe allows exhaust gases to flow more freely from the EA839 turbocharger. Reducing exhaust restriction can help improve turbocharger efficiency and provide a more responsive and aggressive driving experience.
When combined with proper ECU tuning and supporting modifications, the Untd. Performance Catless Downpipe provides an excellent foundation for extracting additional performance from Audi’s 3.0T EA839 turbocharged V6, while significantly enhancing the vehicle’s exhaust character.
Compatibility
- Audi S4 B9 – 3.0T EA839 – 2018+
- Audi S5 B9 – 3.0T EA839 – 2018+
- Audi S5 Sportback B9 – 3.0T EA839 – 2018+
- Audi SQ5 B9 – 3.0T EA839 – 2018+
- Audi SQ5 Sportback – 3.0T EA839
- 3.0T EA839 Turbocharged V6 Applications
Fitment may vary depending on model year, market, chassis configuration, ECU software, emissions equipment, and existing exhaust modifications. Please verify compatibility before ordering.
⚠️ Important Notice
CATLESS / OFF-ROAD USE ONLY: This product eliminates the factory catalytic converter and may not be legal for use on public roads in your jurisdiction. Check your local emissions, inspection, and vehicle regulations before installation.
A Check Engine Light may occur without appropriate ECU calibration. A compatible tune may be required for proper operation and optimal performance.
Professional installation and ECU calibration are recommended.
Untd. Performance is not responsible for emissions compliance, inspection requirements, or the legality of installing or operating this product on public roads.
