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.

‑ Engine: S68 4.4L V8 Twin‑Turbo PHEV

‑ Chassis & Models：

G90 M5 Sedan

G99 M5 Touring

‑ Year: 2024‑Up

‑ Note: Cat‑back only, retains factory catalytic converters / OPF. Please confirm chassis code before placing order.

✅ Material choice: 304 high‑quality stainless steel

✅ Solve OEM weakness: heavy restriction & artificially muted exhaust sound from stock resonators

✅ Mandrel‑bent large‑dia tubing + optimized X‑pipe crossover, improve scavenging & reduce back‑pressure

✅ Integrated electronic valvetronic system: dual‑mode sound, quiet cruising / aggressive race tone

✅ Full professional TIG leak‑proof welding, every unit passes air‑tight & vibration stress test

✅ Jig‑built OEM‑level fitment, exact hanger & mounting point match, perfect diffuser clearance

✅ Multiple tail tip options: polished / burnt‑blue titanium / gloss‑black / forged‑carbon‑fiber quad tips

✅ 100% bolt‑on reversible upgrade, no cutting or grinding required

✅ compatible with stock ECU & stage tuning; works for street & track‑day

✅ Complete hardware package including gaskets, bolts, springs, hangers; fits LHD & RHD global markets