Experience the ultimate combination of sound, performance, and refinement with the Valvetronic Designs Valved Sport Exhaust System for the BMW X3 M40i and X4 M40i. Engineered specifically for the G01 and G02 B58-powered platforms, this system unlocks the aggressive character hidden beneath the factory exhaust while offering unmatched sound control for daily comfort.

Drawing from Valvetronic’s extensive development across other B58 applications, this exhaust system features a massive 3.5-inch midpipe transitioning into optimized piping and dual valve actuators. With the valves fully open, the system unleashes raw, high-output sound with intense turbo spool, aggressive overrun crackles, and a deep tone that builds with RPM. It brings out the emotional, motorsport-inspired qualities of the B58 engine like never before.

When the valves are closed, the system delivers a dramatically quieter, more composed tone suitable for neighborhood driving, early mornings, or long-distance cruising. With over 25 dB of difference between open and closed modes, the system provides the versatility M40i owners demand.

Constructed entirely from premium T304 stainless steel, the exhaust features precision TIG welding and fully mandrel-bent piping for maximum durability, flow efficiency, and longevity. A standalone valve controller is included, allowing you to operate the valves independently of the factory ECU for complete user control. The system also offers a meaningful weight reduction of 25.5 lbs compared to the OEM exhaust.

Designed as a 100% reversible, direct bolt-on upgrade, it requires no cutting, welding, or permanent modification — allowing owners to return to stock at any time.

Key Features:

• Constructed from high-grade T304 stainless steel
• Massive 3.5-inch midpipe for maximum flow and sound output
• Dual actuated valves with standalone controller for full control
• Over 25 dB of difference between open and closed valve modes
• Precision TIG welding ensures strength and long-term durability
• Fully mandrel-bent piping for optimal airflow and reduced backpressure
• 25.5 lbs lighter than the OEM exhaust system
• 100% reversible direct bolt-on installation

Fitment:

• BMW X3 M40i (G01) — All model years equipped with the B58 engine
• BMW X4 M40i (G02) — All model years equipped with the B58 engine