Dinan Cold Air Intake CAI Induction Kit for BMW E46 3 Series 325i 325Ci 325xi (2001-2006) M54/M54B25 2.5L | Sealed Airbox Lid/Filter Upgrade with Ram-Air Brake-Duct Feed | Direct-Fit Bolt-On OEM+ Performance

BMW E46 325 Induction Upgrade by Dinan — for 325i, 325Ci, 325xi 2001 to 2006

Give your E46 3 Series the airflow it deserves with Dinan’s precision-engineered performance induction system, tailored for M54 2.5 models. This OEM+ upgrade replaces the standard air box lid with a larger-volume, heat-resistant composite cover and adds a dedicated cool-air feed, delivering sharper throttle response, a smoother pull through the revs and a subtle, sporty intake sound. It looks factory, fits like factory and feels anything but stock.

Why it works

• Injection-moulded air box lid with increased internal volume to reduce restriction and help the M54 breathe more freely.
• Composite construction resists under-bonnet temperatures to combat heat soak and support consistent intake air temperatures.
• Fully sealed O-ring interface keeps the air box airtight for stable performance in real-world driving.
• High-flow filter element maximises airflow while maintaining OE manners.
• Auxiliary duct draws cool, oxygen-rich air via the factory brake-cooling channel for a reliable cold-air feed at speed.
• Refined induction note without the drone or fuss. Clean, OEM-like presentation once installed.

The Dinan design smartly utilises the stock location and adds volume and sealing where the factory setup falls short. As road speed builds, the additional front duct supplies a steadier stream of cooler air, supporting repeatable performance on daily commutes and weekend B-road blasts alike.

What drivers notice

• Crisper pedal response and improved mid-range urgency.
• More engaging induction character while retaining a factory-quality feel.
• OEM+ fit and finish that integrates seamlessly under the bonnet.

Fitment

Compatible with BMW 3 Series E46 2001 to 2006 equipped with the 2.5-litre M54 engine:
• 325i Saloon, Coupé, Convertible
• 325Ci Coupé, Convertible
• 325xi All-wheel drive variants
Not suitable for M3.

Installation and support

Direct replacement, bolt-on upgrade that uses the factory mounting points and ducting. For professional fitting, book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Proven by us

We have fitted this Dinan kit on customer E46 325 models and on our own cars. Feedback has been consistently positive for fit, finish and the way the M54 responds once the intake is in place.

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Ready to transform your E46’s response and soundtrack. Order the Dinan induction upgrade today and enjoy OEM reliability with enthusiast-grade performance.