Description
Designed specifically for the Audi B9 and B9.5 RS5 2.9T EA839, the Untd. Performance Catless Downpipe is an ideal upgrade for enthusiasts looking for improved turbocharger response, increased performance potential, and a more aggressive exhaust note.
Key Features
Catless Design – Improved Exhaust Flow:
The Untd. Performance Catless Downpipe eliminates the restrictive factory catalytic converter, allowing exhaust gases to flow more freely from the 2.9T twin-turbo V6. Reduced exhaust restriction can help improve turbocharger efficiency and overall exhaust flow.
Improved Turbo Response & Performance:
The freer-flowing design helps the turbochargers expel exhaust gases more efficiently. When combined with an appropriate ECU tune and supporting modifications, the increased exhaust flow can help improve turbo response, throttle response, horsepower, and torque.
Aggressive 2.9T Twin-Turbo Sound:
The catless design significantly enhances the character of the RS5’s twin-turbocharged V6, producing a deeper, louder, and more aggressive exhaust tone while making turbocharger and exhaust sounds more pronounced during acceleration.
Durable Construction:
Built to withstand the high temperatures, exhaust pressure, and demanding conditions produced by the 2.9T EA839 twin-turbocharged engine. Precision-welded construction provides reliable performance under demanding driving conditions.
Direct-Fit Design:
Engineered specifically for the Audi B9 and B9.5 RS5 2.9T EA839, providing a direct replacement for the factory downpipe and designed to work with suitable OEM and aftermarket exhaust components.
Installation Hardware Included:
The downpipe includes replacement gaskets, bolts, and required installation hardware to help provide a proper fit and secure installation. Supplied hardware helps simplify installation and ensures proper sealing and mounting.
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 2.9T EA839 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 after installation and address catalyst-efficiency-related fault codes. Tune requirements can vary depending on model year, ECU software, emissions equipment, and existing modifications.
For optimal performance, drivability, and compatibility, professional ECU tuning is recommended.
Why Upgrade?
The factory catalytic converters are designed primarily for emissions control and can create additional restriction in the exhaust system. Replacing them with the Untd. Performance Catless Downpipe allows exhaust gases to flow more freely from the 2.9T turbochargers.
Reducing exhaust restriction can help improve turbocharger efficiency and provide a more responsive driving experience. When paired with proper ECU tuning and supporting modifications, the catless downpipe provides an excellent foundation for extracting additional performance from Audi’s 2.9T EA839 twin-turbocharged V6.
Along with the performance benefits, the freer-flowing design gives the RS5 a more aggressive and pronounced exhaust character, making the 2.9T engine sound as powerful as it performs.
Compatibility
- Audi RS5 B9 – 2.9T EA839 Twin-Turbo V6
- Audi RS5 B9.5 – 2.9T EA839 Twin-Turbo V6
- Audi RS5 Coupe B9 / B9.5
- Audi RS5 Sportback B9 / B9.5
- 2.9T EA839 Twin-Turbocharged V6 Applications
Fitment may vary depending on model year, market, drivetrain, emissions equipment, ECU software, 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.
pliant in all regions. Please check your local laws before installation.
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