Unleash the authentic V8 character of your Mercedes SUV with Redstar performance exhaust downpipes engineered for the M278 4.7L V8 BiTurbo and M157 5.5L biturbo AMG engines. Precisely developed for 2012-2015 GL450 X166 M278 4.7L, 2012-2014 ML550 4.7L V8 BiTurbo M278, 2012-2015 ML450 4.7L V8 BiTurbo M278, 2012-2015 GL550 4.7L V8 BiTurbo M278, 2016-2019 GLS550 4.7L V8 BiTurbo M278, as well as 2012-2019 ML63 W166, 2013-2019 GL63 GL63S X166, 2015-2020 GLE63 GLE63S C292, 2015-2020 GLE63 GLE63S W166, and 2017-2020 GLS63 X166, these downpipes replace the restrictive factory units to free up flow and soundtrack.

CAD-led development and motorsport-informed manufacturing focus on reducing backpressure for faster turbo response, stronger mid-range torque, and a more engaging throttle feel. Optional OEM-style heat shielding cuts radiant temperatures by up to 80% to help control under-bonnet heat and protect nearby components, while the exhaust note deepens into a richer V8 soundtrack with burbles and crackles.

Built for longevity and precision fitment, each system uses 2.0mm wall 304 stainless steel, is 100 percent TIG welded and back purged, and employs OEM-spec 304 stainless steel flanges with all factory-style brackets and mounts. The result is a true bolt-on performance exhaust upgrade from Redstar that integrates cleanly with your vehicle while delivering a decisive improvement in response, tone, and durability.

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

• Noticeably stronger power and torque delivery
• Faster turbo spool with sharper throttle response
• Richer V8 exhaust note with burbles and crackles
• Lower under-bonnet temperatures with optional shielding
• Enhanced long-term turbocharger durability
• Simple, bolt-on installation to factory locations

Technical Specifications

• 2.0mm wall 304 stainless steel construction
• 100 percent TIG welded and back purged
• OEM-spec 304 stainless steel flanges
• All brackets and mounts as on the OEM unit

Disclaimer

Fitments

• 2012-2015 Mercedes GL450 X166 M278 4.7L
• 2012-2014 Mercedes ML550 4.7L V8 BiTurbo M278
• 2012-2015 Mercedes ML450 4.7L V8 BiTurbo M278
• 2012-2015 Mercedes GL550 4.7L V8 BiTurbo M278
• 2016-2019 Mercedes GLS550 4.7L V8 BiTurbo M278
• 2012-2019 Mercedes-AMG ML63 W166
• 2013-2019 Mercedes-AMG GL63 GL63S X166
• 2015-2020 Mercedes-AMG GLE63 GLE63S C292
• 2015-2020 Mercedes-AMG GLE63 GLE63S W166
• 2017-2020 Mercedes-AMG GLS63 X166
• 2010-2019 Mercedes-AMG GL550
• 2012-2019 Mercedes-AMG ML550