4.4L V8 N63 Catless Downpipes

The ARM Motorsports Catless Downpipes are engineered for BMW models equipped with the 4.4L V8 Twin-Turbo N63/N63B engine, including the G30 M550i, G11 750i, G14/G15/G16 M850i, G05 X5, G06 X6, and G07 X7. Constructed from full 304 Stainless Steel with a 3-inch diameter, these downpipes aim to significantly improve exhaust flow by removing restrictive OEM catalytic converters. This reduction in back-pressure allows the turbochargers to spool faster, contributing to increased power and torque throughout the engine's RPM range. The enhanced exhaust flow also produces a more aggressive sound from the V8 engine, even when paired with the stock exhaust system. Designed with meticulous attention to fitment within the compact BMW engine bay, these downpipes follow the factory exhaust flow path with subtle modifications for smoother airflow and easier installation. They maintain precise mounting points to the turbos and mid-pipes, mirroring the fitment of OEM components. To manage stress and ensure durability, the downpipes feature a flex section and a lower bracket that connects to the transmission housing, utilizing the same secure points as the factory M550i downpipes. The installation process is facilitated by the inclusion of two O2 sensor bungs on each downpipe, allowing for the reinstallation of factory O2 sensors in their original locations. This ensures that accurate sensor data is sent to the DME, which is crucial for proper fuel mixture monitoring and smooth engine operation. This product is intended for off-road use only and is not legal for use on public highways due to emissions regulations. It is crucial to check local, state, and federal laws regarding modified exhaust systems before installation. The package includes the ARM Motorsports Catless Downpipes, ARM Crush Brackets, and a hardware kit.