Eventuri Carbon Fibre Cold Air Intake Kit (CAI) / Induction System – BMW X3 M40i G01 & X4 M40i G02 (B58D) – Performance Air Intake Upgrade with Sealed Carbon Airbox & High-Flow Filter

Premium carbon induction upgrade for BMW G01 X3 M40i and G02 X4 M40i

Unlock sharper throttle response, stronger mid-range pull and addictive turbo sound with this Eventuri carbon fibre induction kit. Designed specifically for the B58D engine in the X3 M40i and X4 M40i, this cold air upgrade delivers a smooth, high-volume airflow path while keeping inlet temps low. Ideal for daily drivers and tuned builds alike, this is the air intake upgrade enthusiasts search for when they want genuine performance, stunning looks and OEM-plus fitment.

Why enthusiasts choose this intake

• Cooler charge temps thanks to a fully enclosed carbon airbox and advanced heat management
• High flow path via a large-bore pre-preg carbon tube that transitions seamlessly to the turbo inlet
• Crisp induction noise and faster turbo spool without drone
• Perfect for BMW tuning, Stage 1 or stock vehicles seeking improved breathing and response
• Showpiece carbon finish that elevates any engine bay

Engineered for the B58D powerplant

The M40i’s engine bay gets hot quickly, especially around the exhaust side. Eventuri tackles heat soak head-on with a fully sealed airbox and a dedicated heat shield lined with gold reflective material to minimise radiant heat. The airbox volume is maximised and neatly shaped with a recess so it clears the factory strut brace for a clean, factory-like install.

The stock plastic ducting is replaced by a precision pre-preg carbon fibre intake tube with a generous 109 mm internal diameter that progressively narrows to the turbo flange. This maintains air velocity and reduces turbulence for a smooth, unrestricted pathway to the compressor. A bespoke dry cone filter, ISO-tested for filtration performance, provides a larger surface area than the factory element to support increased flow while protecting your engine.

Every carbon component is made from 100 percent pre-preg carbon fibre with no fibreglass filler for a smooth internal finish that supports efficient airflow and consistent performance.

Fitment and compatibility

• Chassis: G01 X3 M40i, G02 X4 M40i
• Engine: B58D only
• Not suitable for vehicles with B58 or B58C engines. A version for the standard B58 is due later.
• Part number: EVE-GXXB58-CF-INT

What you get in the box

• Sealed carbon fibre airbox
• High-flow dry cone air filter
• Pre-preg carbon intake tube
• CNC-machined temperature sensor mount
• CNC-machined breather adapter
• CNC-machined turbo flange
• Heat shield with gold reflective backing
• Laser-cut stainless steel brackets
• Silicone coupler and OEM-spec clamps

Real-world results you can feel

We have run this setup ourselves and our customers love the transformation. Expect a more eager throttle, smoother power delivery and a deeper induction tone, all while maintaining factory drivability. The quality, fit and finish are exactly what you would expect from a premium carbon intake.

Professional installation

Want it fitted properly the first time Our workshop can install this intake for you. Book your fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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