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Fi EXHAUST customer reviews are overwhelmingly positive, praising its ability to offer deep, aggressive tones with valves open (like supercars) and near-stock quietness with valves closed, making it great for daily driving. Users love the dramatic sound changes, improved bass/rumble, exotic high-RPM screams, and smart valve control that syncs with factory systems or offers app control, though some note minor drone at specific RPMs with valves open, while appreciating the quality build and fitment.
Sound Quality: Deep, throaty, V8-like at low RPMs; exotic, F1-like screams at high RPMs; “volcano of noise” with dramatic pops/bangs.
Valve Control: Balances quiet cruising with loud performance; valves closed is often quieter than stock, allowing for stealth; integrates with factory systems or uses an app.
Performance: Reduces backpressure, leading to noticeable power gains and improved turbo spool sounds.
Quality & Fitment: High-quality construction, good fitment, and visually appealing options (like carbon tips).
Daily Driving: Excellent for daily use due to quiet valve-closed mode, avoiding drone for comfortable cruising.
Minor Downsides: Occasional drone can occur at specific RPMs (e.g., 1900-2500 RPM) when valves are open, but generally manageable.
BMW Owners: Rave about deep bass, exotic sounds, and dual personalities (stock quiet vs. race car loud).
Supra Owners: Enjoy the bass and rumble, with positive experiences with dealers like Fi EXHAUST.
GT-R Owners: Find it “insanely loud” and a benchmark for quality and sound.
In summary, Fi EXHAUST is highly recommended for its sound engineering, quality, and versatility, offering a truly multi-personality exhaust system.