GFC High-Performance Cat-Back / Axle-Back Exhaust System
For BMW X3 / X4 G01 G02 M40i (B58 3.0T)
Valved | Dual Mufflers | Quad Exit | Direct Bolt-On
Unleash Enhanced B58 Turbo Performance & Tailored Exhaust Flow.
Designed specifically for the BMW X3 M40i (G01) and X4 M40i (G02) equipped with the powerful B58 3.0T engine, this GFC high-performance exhaust system combines precision-engineered mandrel-bent piping, integrated electronic control valves, and high-flow mufflers. It allows you to optimize your exhaust gas scavenging while delivering a deep, aggressive straight-six acoustic roar and a much sharper throttle response.
Open the valves for a bold, track-ready exhaust note that highlights the signature B58 rumble. Close them for a refined, drone-free daily driving experience. Crafted from Premium SUS304 Stainless Steel, this custom-engineered system gives your BMW performance SUV the aggressive sound, improved power delivery, and long-lasting durability it truly deserves.



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