Turner Motorsport Carbon Fibre (Carbon Fiber) Cold Air Intake/Induction Kit, Sealed Airbox – BMW B58 3.0 Turbo M340i M440i G20 G21 G22 G23 3 Series 4 Series Performance Air Filter Upgrade

Give your BMW’s straight-six the induction hardware it deserves. The Turner Motorsport carbon fibre induction system for the B58-powered 3 Series and 4 Series transforms under‑bonnet appearance while delivering freer breathing and reduced restriction for more efficient turbo operation. It is an enclosed carbon airbox solution that integrates with the factory cold air feed and OE mounts, helping to keep inlet temperatures down and flow up.

Engineered for the G20 and G22 platforms, this premium BMW intake upgrade replaces the upper section of the turbo inlet tract with a beautifully made 2x2 twill carbon tube and a sealed heat barrier. Independent flow testing at -15.0 inH2O shows approximately 8% more airflow than the standard assembly, rising from 410.1 cfm to 445.0 cfm. The enclosed carbon lid helps cut intake temperatures by up to 13 degrees compared with open cone setups, supporting consistent performance on road and track.

Highlights that enthusiasts search for

• Direct-fit carbon fibre induction kit for BMW B58 3.0 turbo petrol engines in G20 G21 G22 G23 M340i and M440i models
• Sealed airbox design that works with the OE cold air ducting to minimise heat soak
• High-flow reusable oiled cotton cone filter with bellmouth velocity stack for smoother, less turbulent airflow
• Precision CNC-machined 6061-T6 MAF housing bonded into the carbon tube for accurate sensor placement and factory-style MAF scaling
• 12-gauge 5052 aluminium heat shield with durable wrinkle black powder coat and matching carbon cover
• Gloss clear-coated carbon components with UV protection for a long-lasting showroom finish
• Bolt-on, plug-and-play installation using stock mounting points and supplied hardware
• Less pressure drop after the filter, easing load on the turbocharger

What we think at MJ Modifications

We’ve installed this Turner Motorsport induction kit on customer cars and our own builds. Fitment is spot on, the carbon work is superb, and owners love the OEM+ look and the way it complements other B58 performance upgrades. If you want an intake that adds real quality and proven airflow gains without going open element, this is the one.

Care and maintenance

• If the clear coat is nicked, seal the area with a suitable clear touch-up
• Apply a quality carnauba wax periodically to maintain UV resistance and gloss
• Clean and re-oil the filter as part of regular servicing

Professional fitting

Want it installed properly first time? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote and availability.

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