Cold Air Intake BMW M340i M240i G20 G21 G42 B58 (2020-2026) 3.0L

High-Flow Cold Air Intake for 2020-2026 BMW M340i & M240i (G20/G21/G42 B58)

What it Does: Replaces the restrictive factory air box to lower intake air temperatures, improving volumetric efficiency and increasing turbocharger spool response.

The Stock M340i & M240i Airflow Restriction

The OEM induction system on the BMW 3.0L platform utilizes a closed-box plastic design optimized for NVH (noise, vibration, and harshness) reduction rather than maximum airflow. This restrictive architecture creates turbulence in the intake tract, forcing the turbocharger to work harder to draw in ambient air. During prolonged spirited driving or track sessions, the factory plastic components are prone to severe heat soak, absorbing radiant engine bay temperatures. This elevates intake air temperatures (IATs), prompting the ECU to pull ignition timing and throttle back boost, which directly reduces sustained power output and dampens throttle response.

The Engineering Solution

This cold air intake system overhauls the induction pathway with a high-volume 4-inch intake pipe and a massive 4-inch dry cone filter, significantly reducing pressure drop pre-turbo. Constructed with a durable black powder-coated finish, the smooth inlet pipe minimizes internal friction and optimizes airflow dynamics. The included powder-coated heat shield isolates the filter element from the exhaust manifold and engine block, actively mitigating heat soak. By delivering a denser, cooler air charge, this system yields documented peak gains of 12-14 horsepower and torque. Additionally, the dry filter media ensures easy maintenance and zero risk of MAF sensor oil contamination, all while amplifying the aggressive induction sound of the 3.0L turbo.

Technical Specifications

Compatibility

• For BMW B58 Gen 2 3.0L Turbo (made for the Gen 2 B58 engine)
• 2020-2024 BMW M340i / M340i xDrive G20 Sedan & G21 Touring (2019 International/EU)
• 2022-2026 BMW M240i / M240i xDrive G42 Coupe

The BMW Precision Caliber

Designed for the strict tolerances of modern BMW engine management, this intake system provides bolt-on performance without triggering Check Engine Lights. It delivers the precise airflow, consistent IATs, and aggressive induction tone required for a high-performance European platform.

Common Questions

Will this cold air intake fit my 2025 BMW M340i with the Gen 3 B58 engine?
This system is engineered specifically for the Gen 2 B58 3.0L engine found in the 2020-2024 BMW M340i (2019 International) and 2022-2026 BMW M240i.

Does this fit both RWD and xDrive models of the M340i and M240i?
Yes, it fits both rear-wheel-drive and xDrive all-wheel-drive versions of the G20/G21 M340i and G42 M240i equipped with the Gen 2 B58 3.0L turbo engine.

What components are included in this intake kit?
The kit includes a 4-inch black powder-coated intake pipe, a 4-inch dry cone air filter, and a black powder-coated heat shield.

Does the air filter require oil during maintenance?
The included 4-inch cone filter uses dry filter media, so it requires no filter oil and eliminates the risk of MAF sensor oil contamination.

What kind of power gains can I expect from installing this intake?
By replacing the restrictive factory plastic airbox with a 4-inch inlet pipe and heat shield, this system delivers documented peak gains of 12-14 horsepower and torque along with quicker turbo spool.