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BMW XM G09 Downpipe Guide — Catless & 200-Cell | S68 4.4T V8 Twin-Turbo | Power Gains, Sound & Installation
The BMW XM is BMW M's first dedicated standalone vehicle — a statement-making performance SUV powered by the S68 4.4-liter twin-turbo V8. Whether you own the base XM (644 HP combined) or the XM Label Red (738 HP combined), upgrading the factory downpipes is the most impactful bolt-on modification to unleash the S68's full potential.This guide covers catless and 200-cell downpipe options, power gains, exhaust sound, and why an ECU calibration is required after installation.The S68 4.4T V8 — Platform OverviewThe S68 is BMW's latest-generation 4.4-liter twin-turbocharged V8, featuring a hot-V configuration with 48V mild-hybrid assist. In the XM, it's...