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Valved Cat‑Back Exhaust System for BMW M5 G90 S68 4.4T PHEV dual‑Y mid‑pipe valved rear muffler section


This valved cat‑back exhaust system is designed specifically for BMW G90 M5 Sedan / G99 M5 Touring with S68 4.4L V8 twin‑turbo plug‑in hybrid powertrain. The factory exhaust is heavily silenced with multiple large resonators, resulting in flat, artificial sound and high exhaust back‑pressure, which restricts power output and throttle response even after ECU tuning. Our cat‑back exhaust is constructed from premium T304 stainless steel (titanium optional). It adopts full mandrel bent dual‑Y crossover pipe layout, combined with a centre large‑volume resonator and dual side electronic valve muffler assembly. The optimized gas‑flow path drastically reduces back‑pressure and flow turbulence, unlocking authentic deep V8 turbo soundtrack while minimizing highway cabin drone.