Description
Designed for the VW Golf R Mk8 and Audi S3 8Y 2.0T EA888 evo4 platforms, the Untd. Performance 3.5″ Catless Downpipe is an ideal upgrade for enthusiasts looking to improve turbocharger response, increase horsepower potential, and unleash a more aggressive version of the EA888 evo4 exhaust note.
Featuring an oversized 3.5-inch diameter, this downpipe is designed to maximize exhaust flow and significantly reduce restriction after the turbocharger. When paired with an appropriate ECU tune and supporting modifications, the increased exhaust flow can help unlock additional horsepower and torque from the 2.0T EA888 evo4 engine.
Key Features
3.5″ Catless Design – Maximum Exhaust Flow:
The Untd. Performance Catless Downpipe features a large 3.5-inch diameter designed to maximize exhaust flow and minimize restriction after the turbocharger. Removing the restrictive factory catalytic converter creates a freer-flowing exhaust path and helps reduce exhaust backpressure.
The oversized 3.5″ design provides additional exhaust-flow capacity for tuned and higher-output EA888 evo4 applications.
Improved Turbo Response & Performance:
The high-flow 3.5″ design allows the EA888 evo4 turbocharger to expel exhaust gases more efficiently. When paired with an appropriate ECU tune and supporting modifications, the reduced restriction can help improve turbo response, throttle response, horsepower, and torque.
Aggressive 2.0T Sound:
The catless design significantly enhances the character of the EA888 evo4 four-cylinder engine, producing a deeper, louder, and more aggressive exhaust tone. Turbocharger spool and exhaust notes become more pronounced under acceleration.
Durable Construction:
Built to withstand the high temperatures, exhaust pressure, and demanding conditions generated by the turbocharged EA888 evo4 engine. Precision-welded construction provides dependable performance for both street-performance and competition-oriented applications.
Direct-Fit Design:
Engineered specifically for compatible VW Golf R Mk8 and Audi S3 8Y 2.0T EA888 evo4 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 required installation hardware to help ensure a proper fit and secure installation. Supplied hardware helps simplify installation while providing 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 calibration allows the EA888 evo4 engine and turbocharger to take full advantage of the increased exhaust flow while optimizing boost control, fueling, throttle response, and overall performance.
Estimated Performance Gain
Depending on the ECU calibration, fuel quality, exhaust system, and supporting modifications, a properly tuned vehicle may see meaningful horsepower and torque gains from the reduced exhaust restriction.
For the VW/Audi 2.0T EA888 evo4 platform, the largest gains are expected when the 3.5″ catless downpipe is paired with a downpipe-specific Stage 2 ECU tune. The increased exhaust flow provides additional capacity for higher-output applications while helping reduce restriction after the turbocharger.
| Tuning Level | Estimated HP Gain | Estimated Output |
|---|---|---|
| Stock Tune | ~6–12 HP | ~321–327 HP |
| Stage 1 Tune | ~55–75 HP | ~370–390 HP |
| Stage 2 / Downpipe-Specific Tune | ~80–100 HP+ | ~395–415 HP+ |
Figures are estimated crank horsepower based on 91–93 octane (95–98 RON) pump fuel and stock turbochargers. Actual results will vary depending on the specific vehicle, engine condition, ECU calibration, fuel quality, supporting modifications, and dyno methodology.
The Audi S3 8Y is rated at approximately 306 HP in the referenced configuration and can see similar gains when properly tuned and equipped with the Untd. Performance 3.5″ Catless Downpipe.
The largest gains are expected with a downpipe-specific Stage 2 ECU tune, which is designed to take full advantage of the increased exhaust flow.
⚠️ 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.
Depending on the tuning solution, rear-O2 / catalyst monitoring may need to be addressed through the ECU calibration.
For optimal performance, drivability, and compatibility, professional ECU tuning is recommended.
Why Upgrade?
The factory downpipe and catalytic converter are designed primarily around emissions control and factory operating requirements. These components can create additional restriction in the exhaust system, particularly as engine power and turbocharger airflow increase.
The Untd. Performance 3.5″ Catless Downpipe provides a significantly larger and freer-flowing exhaust path from the turbocharger. The oversized 3.5-inch diameter is designed to support increased exhaust volume and reduce restriction on higher-powered EA888 evo4 applications.
When combined with an appropriate ECU tune and supporting modifications, the downpipe can provide an excellent foundation for extracting additional performance from the VW/Audi 2.0T EA888 evo4 engine.
Compatibility
- Volkswagen Golf R Mk8 – 2.0T EA888 evo4
- Audi S3 8Y – 2.0T EA888 evo4
- VW Golf R Mk8 – 315 HP factory-rated configuration
- Audi S3 8Y – approximately 306 HP factory-rated configuration
- VW/Audi 2.0T EA888 evo4 Turbocharged Applications
Fitment may vary depending on model year, market, drivetrain, transmission, emissions equipment, ECU software, and existing exhaust modifications. Please verify compatibility before ordering.
⚠️ Important Notice
CATLESS / OFF-ROAD / COMPETITION 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.
TUNE REQUIREMENT: This downpipe is intended to work with a compatible ECU calibration. A downpipe-specific Stage 2 tune is recommended to take full advantage of the increased exhaust flow and available performance potential.
PERFORMANCE GAINS ARE ESTIMATES: Actual horsepower and torque gains will vary depending on turbocharger configuration, ECU calibration, fuel quality, supporting modifications, engine condition, and dyno conditions.
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.
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