Unleash your AMG with Redstar Exhaust M139 Downpipes, precision matched to the 2.0L 4cyl M139 in the 2020+ Mercedes A45/A45S AMG Hatchback W177, CLA45/CLA45S AMG Coupe C118, and GLA45/GLA45S AMG SUV H247. This performance exhaust upgrade replaces the factory downpipe assembly to let the M139 breathe as it should, delivering a transformative step for tuning-focused builds.

Engineered with a flow-optimised smooth transition design, these downpipes sharpen throttle response and promote faster turbo spool, while the optional OEM-style heat shielding cuts radiant under-bonnet heat by up to 80% to help protect surrounding components and support turbo longevity. Tailor your setup with high-output catalytic options, including HJS HD 200cpsi and GESI GEN2 400cpsi converters, both rated to support up to 1000hp, or opt for a competition catless configuration for maximum flow.

Built for durability and seamless fitment, each Redstar downpipe uses highest quality 2.0 mm wall 304L stainless steel, is 100% TIG welded and back purged, and features OEM-spec bottom ball flanges with factory-style brackets. The result is a true bolt-on solution that integrates cleanly, is LHD/RHD compliant, and adds a refined, more engaging exhaust tone to your Mercedes AMG. Redstar - performance exhaust engineering without compromise.

Available Options

• HJS HD 200cpsi Catalytic Converters: Engineered in Germany and trusted worldwide, the HJS 200cpsi ultra high-performance cats are rated for over 1000hp. Renowned for exceptional flow, durability, and consistent quality, these converters set the benchmark for high-output applications. Ideal for drivers demanding maximum performance without compromise.
• GESI GEN2 400cpsi Catalytic Converters: The latest GEN2 series from GESI is rated to support up to 1000hp while offering smoother exhaust flow and improved efficiency compared with factory units. Featuring advanced emissions technology for optimal catalyst function at high flow rates. A strong choice for those seeking significant performance gains with refined operation.
• OEM-Style Heat Shielding: Redstar's signature thermal management system reduces radiant exhaust heat by up to 80%. Developed with motorsport-inspired materials and construction, it uses a multi-layer design of ceramic insulation and embossed stainless steel foil. Unlike wraps or coatings that degrade quickly, Redstar shielding delivers long-term durability and consistent protection for engine bay components.
• Competition/Catless: Maximum flow design for uncompromised performance. Delivers the most aggressive exhaust note and optimal power gains. Track use only - not for road use.

Key Performance Benefits

• Noticeable power and torque gains
• Faster turbo spool and sharper throttle response
• Lower engine bay temperatures for improved component longevity
• Enhanced and more engaging exhaust tone
• True bolt-on installation that integrates with factory mounting points

Technical Specifications

• Highest quality 2.0 mm wall 304L stainless steel construction
• 100 percent TIG welded and back purged
• OEM-spec bottom ball flanges
• All brackets and mounts replicated from the OEM unit
• LHD and RHD compliant
• Flow-optimised smooth transition design

Notes

• EURO 5/6 Compliant when equipped with HJS HD 200cpsi catalytic converters

Fitments

• 2020+ Mercedes A45 / A45S AMG Hatchback W177 2.0L 4cyl M139
• 2020+ Mercedes CLA45 / CLA45S AMG Coupe C118 2.0L 4cyl M139
• 2020+ Mercedes GLA45 / GLA45S AMG SUV H247 2.0L 4cyl M139