Transform the soundtrack and response of your Mercedes-Benz S500 / S550 with Redstar Exhaust Performance M278 downpipes, purpose-built for the W222, C217 and A217 platforms running the M278 4.7 biturbo V8. This performance exhaust upgrade replaces the factory downpipes and integrates an X-pipe to refine the note across the rev range.
Freer-flowing pipework enhances exhaust velocity for crisper throttle response, faster turbo spool and meaningful power and torque gains. Expect a deeper, more characterful V8 tone with AMG-style burbles and crackles, while reduced under-bonnet temperatures help support long-term component and turbocharger longevity. The integrated X-pipe helps balance exhaust pulses, delivering a more composed, luxury-appropriate sound without muting the biturbo character.
Engineered for durability and seamless fitment, each Redstar system is built from 2.0mm wall, 3 inch 304 stainless steel, 100 percent TIG welded and back purged, and finished with OEM-spec 304 stainless steel flanges. It is a true bolt-on installation that reuses factory brackets and mounts, and is LHD/RHD compliant. Choose Redstar downpipes for a precision-built performance exhaust solution that elevates your S500 / S550 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 with sharper throttle response
- Helps extend turbocharger service life
- Lower under-bonnet temperatures for more consistent performance
- Rich V8 soundtrack with AMG-style burbles and crackles
- True bolt-on installation using factory mounting points
Technical Specifications
- 2.0mm wall 3 inch 304 stainless steel construction
- 100 percent TIG welded and back purged
- OEM-spec 304 stainless steel flanges
- All brackets and mounts replicated from the OEM unit
- Integrated X-pipe section
- LHD and RHD compatible
