Description
Unleash the full potential and sound of Audi’s 3.0T Supercharged V6 with the Untd. Performance 2.5″ Catless Downpipe, designed to reduce exhaust restriction and improve overall exhaust flow. By replacing the restrictive factory catalytic converter with a high-flow, catless design, this upgrade allows exhaust gases to exit the engine more efficiently.
Ideal for enthusiasts looking for improved performance, sharper throttle response, and a more aggressive exhaust note, the Untd. Performance Catless Downpipe is an excellent upgrade for the Audi S4, S5, SQ5, A6, and A7 equipped with the 3.0T Supercharged V6.
Key Features
Catless 2.5″ Design – Improved Exhaust Flow:
The Untd. Performance Catless Downpipe removes the restrictive factory catalytic converter, allowing exhaust gases to flow more freely through the exhaust system. The reduction in backpressure can help improve exhaust flow and overall engine efficiency.
Improved Performance & Throttle Response:
With reduced exhaust restriction, the 3.0T Supercharged V6 can benefit from improved exhaust evacuation and throttle response. When combined with ECU tuning and supporting modifications, the downpipe can help unlock additional horsepower and torque.
Aggressive 3.0T Supercharged Sound:
The catless design significantly enhances the character of the 3.0T V6, producing a deeper, louder, and more aggressive exhaust tone. It also makes the supercharged engine note more pronounced during acceleration.
Stainless Steel Construction:
Manufactured from high-quality stainless steel for excellent durability and resistance to the extreme heat generated by the 3.0T Supercharged V6. Precision-welded construction provides reliable performance for both performance and enthusiast applications.
Direct-Fit Design:
Engineered specifically for compatible Audi 3.0T Supercharged applications, 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 nuts to help ensure a proper fit and secure installation. Supplied hardware helps simplify installation and provides the necessary components for 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 tuning can help optimize the vehicle for the increased exhaust flow and allow the engine to take full advantage of the modification.
Estimated Performance Gain
Because this product replaces only the lower portion of the exhaust system, gains are generally smaller than those of a complete downpipe. The factory ECU also limits how much additional airflow can be utilized.
| Configuration | Estimated HP Gain | Estimated Torque Gain | Estimated Output |
|---|---|---|---|
| Stock Tune | ~2–5 HP | ~3–6 lb-ft | ~335–338 HP |
| Stage 1 Tune | ~70–80 HP | ~65–85 lb-ft | ~403–413 HP |
| Stage 2 + Test Pipe | ~80–120 HP+ | ~75–95 lb-ft | ~413–452 HP |
Performance estimates are approximate platform-level figures. Actual results will vary depending on ECU calibration, fuel quality, vehicle condition, supporting modifications, and dyno methodology. Estimates assume crank horsepower, 91–93 octane (95–98 RON) pump fuel, and otherwise appropriate factory hardware.
Important: On the supercharged EA837, many Stage 2 packages also incorporate a smaller crank pulley. The larger Stage 2 power increase is therefore not necessarily attributable to the lower downpipe alone.
⚠️ 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 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 catalytic converter is designed primarily for emissions control and can create additional restriction within the exhaust system. Replacing it with the Untd. Performance Catless Downpipe allows exhaust gases to flow more freely, helping reduce restriction and improve the overall responsiveness of the vehicle.
For owners looking to maximize the performance and sound of their Audi 3.0T Supercharged V6, the catless downpipe provides an excellent foundation for further modifications. When paired with an appropriate ECU tune and supporting upgrades, it can complement a performance-focused setup while giving the exhaust a significantly more aggressive character.
Compatibility
- Audi S4 B8 – 3.0T Supercharged V6
- Audi S4 B8.5 – 3.0T Supercharged V6
- Audi S5 B8 – 3.0T Supercharged V6
- Audi S5 B8.5 – 3.0T Supercharged V6
- Audi SQ5 B8 – 3.0T Supercharged V6
- Audi SQ5 B8.5 – 3.0T Supercharged V6
- Audi A6 C7 – 3.0T Supercharged V6
- Audi A6 C7.5 – 3.0T Supercharged V6
- Audi A7 C7 – 3.0T Supercharged V6
- Audi A7 C7.5 – 3.0T Supercharged V6
Fitment may vary depending on model year, drivetrain, transmission, market, emissions equipment, and existing 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.
