BMW G90 / G99 M5 Fi Exhaust System – Reclaim the Sound of M
The stock exhaust on the BWM G90 / G99 M5 filters out the character and emotion M drivers expect—leaving behind a tone that’s too tame for the badge it wears. Between two oversized resonators, OPF filters on European models, and artificial sound pumped through the speakers, the stock setup filters out the very essence of the M experience.
The Fi Exhaust Valvetronic System is engineered to bring that experience back—with raw sound, increased flow, and real driver engagement.
Real Sound, Real Control
With valves closed, the system delivers a refined 101 dB tone for comfortable cruising. Open the valves, and the full M personality comes alive with a track-ready 122 dB roar. During testing, we recorded a +34 dB increase over stock (Euro-spec, 88 dB valves open) using the following configuration: • 200-cell catted primary downpipes • Catless secondary downpipes • Valvetronic catback exhaust with OPF bypass
Performance with Purpose
The catback exhaust system features a free-flowing X-pipe and a single-chamber muffler (vs. triple chambers in stock), improving exhaust gas scavenging and tone clarity. When installed as part of a full catless setup, average power gains of 5–10% can be expected—thanks to reduced backpressure and optimized flow.
Unleash the sound BMW engineered without unnecessary restrictions. The Fi Exhaust System for the G90 / G99 M5 is the upgrade your M deserves—raw, refined, and ready to roar.
If you plan to upgrade the downpipes, we recommend a Stage 2 tune, as you're replacing factory catalytic converters and the ECU must be adjusted to prevent a Check Engine Light (CEL) from being triggered?
