Transform the soundtrack and response of your Mercedes AMG GLC63 and GLC63S X253 4.0 biturbo engine, and Mercedes AMG GLC63 and GLC63S Coupe C253 4.0 biturbo engine with Redstar performance exhaust downpipes. Designed as direct replacements for the factory downpipes, this upgrade targets flow and sound while maintaining seamless integration with OEM mounting points.

Expect sharper throttle response, quicker turbo spool and a meaningful step-up in power delivery, all accompanied by a richer, more engaging exhaust note. Optional HJS HD 200cpsi and GESI GEN2 400cpsi high-performance catalytic converters are available, alongside a Competition/Catless configuration. Redstar's OEM-style Heat Shielding option uses motorsport-inspired construction to cut radiant heat by up to 80%, helping manage under-bonnet temperatures for more consistent performance.

Every system is built for longevity and precision fitment, featuring 2.0mm wall 304 stainless steel, 100% TIG welding with full back purging, OEM-spec V-band flanges, and all brackets and mounts aligned to the original equipment layout. Crafted for enthusiasts who value engineering integrity, Redstar downpipes deliver the unmistakable Redstar sound and performance edge.

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 from reduced backpressure
• Faster turbo spool and crisper throttle response
• Helps manage engine bay temperatures for greater consistency
• Deeper, more engaging exhaust tone
• True bolt-on installation for straightforward fitment

Technical Specifications

• 2.0mm wall 304 stainless steel construction
• 100% TIG welded and back purged for strength and internal cleanliness
• OEM-spec V-band flanges for secure, leak-free joints
• All brackets and mounts mirrored from the OEM design for precise alignment

Fitments

• 2015-2023 Mercedes AMG GLC63 / GLC63S X253 4.0 biturbo engine
• 2016-2023 Mercedes AMG GLC63 / GLC63S Coupe C253 4.0 biturbo engine