Unleash your BMW G90 M5 or G99 M5 Touring with Redstar Exhaust Secondary Downpipes for the S68 M60i engine. These secondary downpipes replace the restrictive secondary catalytic converters for a true secondary cat delete, delivering a direct plug-and-play upgrade that interfaces cleanly with the factory system.
By opening up the post-turbo exhaust path, the Redstar setup improves gas flow for sharper throttle response, quicker spool, noticeable power gains and a deeper, more assertive exhaust tone. An OEM-style heat shielding option is available to reduce radiant heat by up to 80%, helping to control under bonnet temperatures and support long-term turbo health. The system is designed to operate without triggering a Check Engine Light or error codes.
Built for demanding use, each assembly is crafted from 2.0mm wall 304 stainless steel, fully TIG welded and back purged with OEM-spec flanges and factory-style brackets. It is a true bolt-on performance exhaust solution from Redstar that combines durability, precision fit and proven results. Sold only with the Complete Downpipes System.
Available Options
- 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.
Key Performance Benefits
- Noticeable power and torque gains by removing the restrictive secondary catalytic converters
- No Check Engine Light or error codes
- Faster turbo spool and crisper throttle response
- Reduced under bonnet temperatures for improved component protection and turbocharger longevity
- Deeper, more assertive exhaust note
- Bolt-on installation that integrates with factory mounting points
Technical Specifications
- 2.0mm wall 304 stainless steel
- TIG welded and back purged
- OEM-spec flanges
- Brackets and mounts match OEM layout
