K&N High-Flow Washable Panel Air Filter for BMW 3 Series E46 320i/320Ci, 323i/323Ci, 328i/328Ci (1998-2005) - Reusable Drop-In OEM Replacement

BMW E46 3 Series 320i 320Ci 323i 323Ci 328i 328Ci performance intake filter upgrade

Give your E46 a sharper throttle response and stronger mid‑range with this K&N reusable cotton gauze panel insert. It slips straight into the standard airbox on the 1998 to 2005 BMW 3‑Series listed below, increasing airflow while maintaining excellent filtration. Clean it, re‑oil it and refit it for a lifetime of use, reducing waste and saving you money versus throwaway paper elements.

Why enthusiasts choose this sports filter

• Improves intake flow for quicker pick‑up and smoother acceleration
• Reusable, washable cotton media for long‑term value and reduced maintenance costs
• Direct‑fit panel insert for the factory airbox — no cutting, no mapping, no fuss
• Service interval up to 50,000 miles depending on conditions
• Works seamlessly with factory ECU and sensors
• Backed by K&N's Million‑Mile Limited Warranty for peace of mind

Fitment — E46 petrol models

Compatible with BMW 3‑Series E46 1998 to 2005 fitted with the standard airbox:

• 320i and 320Ci
• 323i and 323Ci
• 328i and 328Ci
• Saloon, Touring, Coupe and Convertible

Tried, trusted and enthusiast approved

We run these filters on our own cars and our customers consistently report crisper response, a subtle induction note and strong reliability over years of use. It is the simplest breathing upgrade for an E46 road car and a brilliant foundation for future mods.

Installation and support

Straightforward DIY swap using basic tools. Prefer professional fitting or an intake health check? Book with MJ Modifications in Warwickshire. Request a quote via info@mjmodifications.co.uk.

Search terms to help you find the right part

BMW E46 3‑Series intake filter upgrade, sports panel filter 320i 323i 328i, cotton gauze reusable filter E46, high flow panel insert for stock airbox, induction upgrade 3‑Series 1998 1999 2000 2001 2002 2003 2004 2005, K and N panel insert BMW 320Ci 323Ci 328Ci, washable serviceable air filter BMW petrol six‑cylinder, performance intake element E46 coupe saloon touring convertible, OEM airbox direct fit sports filter, lifetime air filter for BMW E46.