Dinan Carbon Fibre Cold Air Intake / Induction Kit for BMW M340i (2019-2021) G20/G21 B58 Turbo – Performance Air Intake System & Carbon Airbox Upgrade | Fits M340i xDrive 3 Series | CAI Intake Upgrade

Unlock induction roar and real-world performance for your BMW M340i

Give your 2019 to 2021 BMW M340i the intake upgrade it deserves with this premium Dinan carbon fibre induction system. Engineered for the B58 3.0 turbo, this performance air intake replaces the restrictive factory airbox with a beautifully crafted, high-flow solution that looks stunning and delivers genuine gains you can feel and hear.

Expect sharper throttle response, a deeper induction note and that addictive turbo spool and whoosh on lift-off. Our team has run this kit on customer cars and the feedback has been fantastic. It transforms the character of the car without compromising refinement.

Why this carbon fibre induction kit stands out

• Proven power: up to +9 WHP and +8 lb-ft of torque at 6500 rpm on a standard vehicle.
• Big airflow increase: over 58 percent more flow than the factory intake for stronger top-end pull.
• Larger airbox volume: approximately 60 percent bigger enclosure to feed the B58 efficiently.
• Higher filter capacity: around 40 percent more filter area for sustained performance.
• Enhanced soundtrack: more pronounced turbo and blow-off acoustics with a sportier induction note.
• Crisper response: improved transient performance thanks to reduced restriction.
• Quick, straightforward installation.

Intelligent design for cool, consistent performance

Dinan re-engineered not just the lid, but the entire lower housing to maximise available space in the bay. The enlarged, free-flowing filter sits in a semi-open carbon fibre enclosure that is carefully vented on the side away from engine heat. The auxiliary openings were tested across varied conditions to add volume and sound without elevating turbo inlet temperatures, so you get the drama without the heat-soak drawbacks common to fully open intakes.

Made to be seen as much as heard

The carbon fibre weave and clean OEM-plus fitment make this an under-bonnet showpiece for the G20 and G21 platform. It is the perfect finishing touch for a tasteful, performance-led build.

Compatibility

BMW M340i 2019 to 2021. B58 engine. G20 and G21 3 Series platform.

Professional fitting available

Want it installed properly the first time? Book expert fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

In summary

If you are searching for a BMW M340i induction kit, performance air intake, carbon fibre airbox, G20 M340i intake upgrade or B58 intake system, this Dinan solution delivers the airflow, sound and quality you want. Order with confidence from MJ Modifications and enjoy a more responsive, more engaging drive.