Transform your BMW M5 and M6 with Redstar performance exhaust downpipes engineered for the S63B44 4.4 V8 Bi-Turbo. Precisely developed for the 2012-2016 BMW M5 F10 Sedan and 2012-2018 BMW M6 F12 Coupe, F13 Convertible, and F06 Gran Coupe, these Redstar downpipes are a direct, 100% bolt-on upgrade tailored to the demands of the BMW M TwinPower Turbo platform.

Expect a marked step-up in response and drivability. Improved exhaust flow delivers faster turbo spool, sharper throttle feel, and noticeable power gains, while a richer, more engaging exhaust tone enhances every drive. Pair with optional OEM-style heat shielding to cut radiant exhaust temperatures by up to 80%, helping keep under-bonnet temperatures in check and supporting turbo longevity. Choose from HJS HD 200cpsi, GESI GEN2 400cpsi, or Competition/Catless configurations to suit your target setup.

Built for durability and precision, each system is crafted from highest quality 2.0 mm wall 304 stainless steel, 100% TIG welded and back purged, and finished with OEM-spec V-band flanges plus factory-style brackets and mounts. Redstar downpipes deliver the robust construction, seamless fit, and performance focus enthusiasts expect from a true performance exhaust upgrade for the BMW M5 and M6.

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 improved exhaust flow
• Faster turbo spool and crisper throttle response
• Reduced under-bonnet temperatures during spirited driving
• Enhanced exhaust tone with a more engaging character
• True bolt-on fitment for straightforward installation
• Supports long-term turbocharger health by lowering backpressure

Technical Specifications

• Highest quality 2.0 mm wall 304 stainless steel construction
• 100% TIG welded and back purged for strength and clean interiors
• OEM-spec V-band flanges for secure, leak-resistant sealing
• Brackets and mounts replicate OEM layout for precise fitment

Fitments

• 2012-2016 BMW M5 F10 Sedan S63B44 4.4 V8 Bi-Turbo
• 2012-2018 BMW M6 F12 Coupe S63B44 4.4 V8 Bi-Turbo
• 2012-2018 BMW M6 F13 Convertible S63B44 4.4 V8 Bi-Turbo
• 2013-2018 BMW M6 F06 Gran Coupe S63B44 4.4 V8 Bi-Turbo