S68 Secondary Downpipes

The RedStar Exhaust Secondary Downpipes are engineered as a performance upgrade for the BMW X5M and X6M LCI Competition models equipped with the S68 engine. These downpipes are designed to replace the restrictive factory secondary catalytic converters, thereby significantly improving exhaust flow and unlocking the full performance potential of your vehicle's V8 platform. The installation is described as a seamless, plug-and-play process, utilizing OEM-spec flanges and all original brackets and mounts. Constructed from the highest quality 2.0mm wall 304 stainless steel and 100% TIG welded with back purging, these downpipes are built for durability and performance. The result is an increase in horsepower, faster turbo spool-up, sharper throttle response, and a more aggressive exhaust note without compromising drivability. Key features include a significant power gain, no Check Engine Light illumination, increased turbo longevity, and reduced under-hood temperatures. RedStar offers OE-style heat shielding as an optional upgrade, featuring a ceramic inner liner designed to reduce radiant heat by up to 70-80%. This product is intended for OFF ROAD/MOTORSPORT USE ONLY. It is not certified and may not be legal on emissions-controlled vehicles. For optimal performance and calibration, ECU tuning is highly recommended, with Purisic Performance being the suggested tuner.