Air intake for BMW M340i G20 G21 B58 (2019-2025) 3.0L

High-Flow Cold Air Intake for 2019-2025 BMW 3 Series (B58 / G20)

Replaces the restrictive factory air box with a high-volume aluminum induction system to decrease intake air temperatures and maximize volumetric efficiency on B58-equipped G-Series models.

The Stock 3 Series Intake Limitation

The factory intake system on the B58-powered M340i is engineered primarily for noise, vibration, and harshness (NVH) reduction rather than peak performance. The OEM plastic housing and corrugated inlet hose create significant internal turbulence, while the thick paper filter media restricts airflow at higher RPMs. Furthermore, the closed-box design is prone to heat soak during spirited driving, as the plastic retains thermal energy, eventually warming the intake charge and forcing the ECU to pull timing to prevent knock. This results in a measurable loss of power during consistent high-load scenarios.

The Engineering Solution

This performance intake kit utilizes high-grade aluminum piping to ensure a smooth, laminar airflow path directly to the turbocharger inlet. By transitioning to a 360° inverted cone filter, the system significantly increases the available filtration surface area compared to stock. To combat thermal saturation, the kit includes a precision-cut heat shield designed to isolate the filter element from the radiant heat of the B58 engine block. The aluminum construction dissipates heat faster than OE plastics, while the dry-media filter allows for higher CFM throughput without compromising filtration integrity, resulting in improved throttle response and a more aggressive turbo spool-up sound.

Technical Specifications

Compatibility

• BMW 3 Series G20 Sedan (2019-2025): M340i, M340i xDrive
• BMW 3 Series G21 Touring (2019-2025): M340i, M340i xDrive

The BMW Precision Standard

Engineered for the G-Series chassis, this intake system maintains European tuning standards by ensuring consistent MAF sensor readings to prevent Check Engine Lights (CEL). It provides the mechanical precision required for the B58 platform, delivering a balanced increase in induction acoustics and horsepower without compromising the refined drivability expected of a modern M-Performance vehicle.