Unleash sharper performance from your BMW M5 F90 4.4 L S63 twin-turbocharged V8, BMW X5M F95, BMW X6M F96 and BMW M8 F91 F92 F93 with Redstar performance exhaust downpipes. These upper primary slip-on style downpipes are engineered for precise fitment and optimised flow, replacing the restrictive factory primary sections while retaining full compatibility with the OEM system.
By reducing exhaust restriction, they deliver quicker turbo spool, crisper throttle response and measurable power gains, while lowering under-bonnet heat to help protect components and support turbo longevity. Configure your system with premium catalytic options - HJS HD 200cpsi ultra high-performance converters rated for 1000+ hp or GESI GEN2 400cpsi converters rated for 1000 hp - and add OEM-style heat shielding with a ceramic inner liner for dramatic reductions in radiant heat. The result is a deeper, more engaging exhaust note without compromising daily drivability.
Built for durability and accuracy, each Redstar downpipe uses 2.0mm wall 304 stainless steel with 100% TIG welding and back purging, OEM-spec V-band flanges, and factory-style brackets and mounts. The true bolt-on design ensures straightforward installation and a leak-free seal. Trusted by enthusiasts for robust construction, precise fit and repeatable results, Redstar downpipes are the definitive upgrade for S63-powered BMW performance cars.
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 crisper throttle response
- Helps extend turbocharger service life by reducing strain
- Lowers under-bonnet temperatures
- Richer, more engaging exhaust tone
- Simple bolt-on installation with factory-style fitment
Technical Specifications
- Configuration: upper primary slip-on style downpipe only
- Material: 2.0mm wall 304 stainless steel
- Welding: 100% TIG welded and back purged
- Flanges: OEM-spec V-band flanges
- Mounting: brackets and mounts replicate the OEM unit
