Eventuri BMW B58 Carbon Fibre Cold Air Intake / Induction Kit G20 G21 G22 G23 (M340i & M440i) - Sealed Dual-Feed Airbox, Enlarged Carbon Inlet Tube - V1/V2

Eventuri B58 Carbon Fibre Intake Upgrade for BMW G20 G21 G22 G23 M340i and M440i

Unlock sharper response and addictive turbo acoustics with Eventuri’s autoclaved carbon induction system for the BMW G-series six‑cylinder. This premium closed airbox setup feeds your turbocharger with cool, high volume airflow via twin fresh‑air channels and an oversized smooth‑bore carbon intake pipe, delivering a genuine cold‑air solution that resists heat soak and cuts pressure drop.

At MJ Modifications we have installed and used this kit extensively on customer cars. Feedback is consistently excellent, with owners reporting crisper throttle, quicker spool in the mid‑range, reduced intake temperatures in traffic and a tasteful induction note without cabin drone. If you want a top‑tier air intake upgrade that looks as good as it performs, this is the one.

Why this intake belongs on your B58

• Closed airbox with twin cold‑air feeds, primary front duct plus a secondary arch duct for consistent intake temps beside the hot manifold.
• Gold heat barrier on the manifold side helps block radiant heat for repeatable performance on road and track.
• Maximum airbox volume, pre‑preg carbon construction with a smooth internal surface for efficient airflow.
• Oversize carbon intake pipe, up to approximately 109 mm internal diameter on post Nov 2018 cars, tapering cleanly to the turbo inlet to reduce turbulence versus the corrugated OE tube.
• High‑flow dry cone filter, ISO‑tested media, larger filtering area than factory, with an internal flow cone to aid velocity and convergence.
• Precision hardware throughout, CNC machined sensor and breather mounts, stainless brackets, quality silicone and clamps.

Technical highlights

The G‑chassis straight‑six places the intake next to the exhaust manifold, so temperature control is vital. Eventuri’s sealed carbon airbox encapsulates the filter and uses a perimeter seal to keep engine bay air out. A gold reflective shield faces the hot side, while a secondary cold‑air path from the wheel‑arch area supplements the main front duct so the turbo can breathe from a larger, cooler air supply even at low speeds.

The factory intake hose has a flexible, convoluted section that can disturb flow. Eventuri replaces it with a smooth‑bore, larger diameter carbon tube that maintains velocity and reduces pressure drop. The tube integrates neatly with OEM connections and includes CNC machined provisions for the relevant sensor and breather.

Versions and part numbers

BMW revised the sensor arrangement around late 2018. Choose the correct version for your production date and sensor type:

• EVE-G20B58-V1-INT - V1 for vehicles built before November 2018, mass airflow sensor located in the intake tube.
• EVE-G20B58-V2-INT - V2 for vehicles built after November 2018, temperature sensor located in the intake tube.

Not sure which you need? Remove the sensor from your stock intake pipe and check whether it is a MAF sensor or a temperature sensor before ordering.

What you get

• Carbon fibre airbox with twin fresh‑air feeds
• Eventuri high‑flow dry cone filter
• Smooth‑bore carbon intake tube
• CNC machined mounts for sensor and breather
• Gold backed heat shield
• Laser‑cut stainless brackets
• Quality silicone reducer with OEM‑style clamps

Vehicle compatibility

• BMW 3 Series G20 M340i xDrive and rear‑wheel drive, B58
• BMW 3 Series G21 M340i Touring xDrive and rear‑wheel drive, B58
• BMW 4 Series G22 M440i Coupe xDrive and rear‑wheel drive, B58
• BMW 4 Series G23 M440i Convertible xDrive and rear‑wheel drive, B58

Note, cars produced before November 2018 typically require V1. Cars produced after November 2018 typically require V2.

Who it suits

Ideal for standard vehicles seeking improved response and sound, and equally at home on Stage 1 and Stage 2 software calibrations where lower restriction and better temperature control help the turbo work more efficiently.

Professional fitting

Direct replacement for the factory airbox and hose. Professional installation recommended. For expert fitting and setup, contact MJ Modifications in Warwickshire for a quote at info@mjmodifications.co.uk.

Manufacturer and warranty

Manufactured by Eventuri. One year Eventuri warranty.

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