Transform the soundtrack and response of your Mercedes AMG GT, GTS, GTR and GTC C190/R190 with Redstar performance exhaust downpipes for the M178 4.0 twin-turbo V8. Designed as a direct, bolt-on replacement for the factory downpipes across 2015-2021 models, this system unleashes that distinctive AMG V8 character with the burbles and crackles enthusiasts demand.

By relieving backpressure and improving gas flow, Redstar downpipes sharpen throttle response, promote faster turbo spool and unlock meaningful power gains. Under-bonnet heat is also significantly reduced when specified with Redstar's OEM-style heat shielding, cutting radiant exhaust heat by up to 80% to help protect surrounding components and support turbo longevity. The result is a cleaner, more assertive exhaust note that elevates every drive.

Built to Redstar's exacting standards, each assembly uses 2.0mm wall 304 stainless steel, is 100% TIG welded and back purged, and interfaces via OEM-spec flanges with factory-style brackets and mounts. The outcome is a precision-engineered performance upgrade that fits like stock, delivers like a motorsport part and showcases the durability and quality Redstar is known for.

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.
• OPF: For European Emission cars only.

Key Performance Benefits

• Significant power gain
• Faster spool up and crisper throttle response
• Helps increase turbocharger longevity
• Noticeably lower under-bonnet temperatures when specified with Redstar heat shielding
• Richer, more engaging V8 tone with burbles and crackles
• True bolt-on installation for straightforward fitment

Technical Specifications

• Constructed from 2.0mm wall 304 stainless steel
• 100% TIG welded and back purged
• OEM-spec flanges for factory-style integration
• Includes brackets and mounts in OEM locations

Notes

• LHD and RHD compliant
• Not interchangeable with Black Series

Fitments

• 2015-2021 Mercedes AMG GT C190/R190 - M178 4.0 twin-turbo
• 2015-2021 Mercedes AMG GTS C190/R190 - M178 4.0 twin-turbo
• 2015-2021 Mercedes AMG GTR C190/R190 - M178 4.0 twin-turbo
• 2015-2021 Mercedes AMG GTC C190/R190 - M178 4.0 twin-turbo