Description
Designed for the Mercedes-AMG A35 W177 2.0T M260, the Untd. Performance Catless Downpipe is an ideal upgrade for enthusiasts looking to reduce exhaust restriction, improve turbocharger response, increase horsepower potential, and unleash a more aggressive version of the AMG 2.0T sound.
By removing the restrictive factory catalytic converter and providing a significantly freer-flowing exhaust path from the turbocharger, the Untd. Performance Catless Downpipe helps reduce exhaust backpressure and allows the M260 turbocharged engine to expel exhaust gases more efficiently. When paired with an appropriate ECU tune, this downpipe can help unlock additional performance from the AMG A35 platform.
Key Features
Catless Design – Maximum Exhaust Flow:
The Untd. Performance Catless Downpipe eliminates the restrictive factory catalytic converter, creating a significantly freer-flowing exhaust path from the turbocharger. Reduced exhaust restriction helps minimize backpressure and allows the M260 engine to move exhaust gases more efficiently.
Improved Turbo Response & Performance:
The freer-flowing design allows the turbocharged 2.0T engine to evacuate exhaust gases more efficiently. Reduced backpressure can help improve turbocharger response, throttle response, horsepower, and torque, especially when combined with an appropriate ECU calibration.
Aggressive AMG 2.0T Sound:
The catless design enhances the character of the M260 engine, producing a deeper, louder, and more aggressive exhaust tone. Turbocharger spool and exhaust volume become more noticeable under acceleration while maintaining the performance-oriented AMG character.
Designed for the M260 2.0T Platform:
Engineered specifically for the Mercedes-AMG A35 W177 equipped with the M260 turbocharged 2.0T engine, providing a direct performance upgrade over the factory downpipe configuration.
Durable Construction:
Built to withstand the high exhaust temperatures, pressure, and demanding conditions generated by the turbocharged M260 engine. Precision-welded construction provides dependable performance for both street-performance and competition-oriented applications.
Direct-Fit Design:
Designed specifically for compatible Mercedes-AMG A35 W177 2.0T applications, allowing installation as a replacement for the factory downpipe while maintaining compatibility with suitable OEM and aftermarket exhaust components.
Installation Hardware Included:
The downpipe includes the necessary clamps, bolts, and required installation hardware where applicable to help ensure a secure installation and proper sealing.
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 M260 engine to take full advantage of the increased exhaust flow while optimizing boost control, ignition timing, fueling, throttle response, and overall performance.
Estimated Performance Gain
Depending on the ECU calibration, fuel quality, exhaust system, turbocharger configuration, and supporting modifications, a properly tuned vehicle may see meaningful horsepower and torque gains from the reduced exhaust restriction.
For the Mercedes-AMG M260 2.0T platform, the largest gains are generally achieved when the catless downpipe is combined with an appropriate Stage 2 / downpipe-specific ECU calibration designed to take advantage of the increased exhaust flow. The tune may also require rear-O2 / catalyst monitoring to be disabled following removal of the factory catalytic converter.
| Configuration | Estimated HP Gain | Estimated Output |
|---|---|---|
| Stock Tune | ~5–10 HP | ~307–312 HP* |
| Stage 1 Tune | ~50–70 HP | ~352–372 HP* |
| Stage 2 / Downpipe-Specific Tune | ~65–85 HP+ | ~367–387 HP* |
Figures are estimated crank horsepower based on a 302 HP Mercedes-AMG A35 W177 reference configuration, 91–93 octane (95–98 RON) pump fuel, and stock turbocharger hardware. Actual results will vary depending on the specific vehicle, ECU calibration, fuel quality, engine condition, supporting modifications, and dyno methodology.
⚠️ Check Engine Light Warning
A Check Engine Light (CEL) is expected after installing a catless downpipe with the factory ECU calibration due to the removal of the factory catalytic converter and the resulting change in exhaust emissions readings.
A compatible ECU tune is strongly recommended and may be required to properly calibrate the vehicle after installation and address catalyst-efficiency-related fault codes.
A downpipe-specific Stage 2 calibration may require rear-O2 / catalyst monitoring to be disabled for proper operation following removal of the factory catalytic converter.
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 downpipe and catalytic converter are designed primarily around emissions control, noise requirements, and factory operating specifications. These components can create additional exhaust restriction, limiting exhaust flow as turbocharger airflow and boost pressure increase.
The Untd. Performance Catless Downpipe replaces the restrictive factory configuration with a significantly freer-flowing exhaust path from the turbocharger.
By reducing exhaust backpressure and improving exhaust gas evacuation, this upgrade provides a stronger foundation for tuned applications. When combined with an appropriate ECU tune and supporting modifications, the downpipe can help extract additional performance from the Mercedes-AMG M260 2.0T turbocharged engine.
Compatibility
- Mercedes-AMG A35 W177 – 2019+
- Mercedes-AMG A35 4MATIC – M260 2.0T
- Mercedes-Benz W177 A35 2.0T Applications
- Mercedes-AMG M260 Turbocharged 2.0T Engine
Fitment may vary depending on model year, engine code, drivetrain, transmission, 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.
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.
