MMR Cotton Panel Air Filter - High-Flow Washable Drop-In for BMW G-Series B58TU 3.0 & B48/B46 2.0 (G20 G21 G22 G23 G26 G42 G29) and Toyota Supra J29 A90/A91 | OE Airbox Performance Upgrade | Fits 3 Series 4 Series Z4 M240i 330i 340i 430i 440i M40i

Unlock effortless intake performance with this high-flow, reusable cotton gauze panel element for BMW G-series petrol models and Toyota GR Supra. A quick, plug-in upgrade for the factory air box that lets your engine breathe better, sharpen response and add a purposeful induction note without check engine lights or compromising daily reliability.

We run this exact panel on our own shop cars at MJ Modifications and it has been superb. Customers love the crisper throttle feel, smoother pull through the rev range and the subtle growl under load. In back-to-back testing on a stock B58, we saw up to 15 Nm additional torque. It is the perfect OEM-plus intake enhancement that keeps everything looking stock while delivering tangible gains.

Key benefits

• Free‑flowing cotton gauze media for improved engine breathing compared to a paper element
• Direct-fit insert for the stock air box - no cutting, no drilling, no remap required
• Washable and serviceable for long-term use - clean, re‑oil and refit
• Refined intake sound with the cold-air feed retained
• OEM-level fit and finish for a factory look
• Proven results - our in-house testing on a standard B58 showed up to +15 Nm

Compatibility

Designed for BMW G-series petrol models with the 2.0 turbo four-cylinder and 3.0 turbo six-cylinder, plus Toyota Supra.

• BMW 2 Series G42 - 218i, 220e, 220i, 230i, M240i
• BMW 3 Series G20 and G21 - 320i, 330i, M340i including xDrive
• BMW 4 Series G22, G23, G26 - 420i, 430i, 440i including xDrive and Gran Coupe
• BMW Z4 G29 - 20i, 30i, M40i
• Toyota Supra J29 A90 and A91 - 2.0 and 3.0

Engine codes covered: B46 2.0 turbo, B48 2.0 turbo, B58TU 3.0 turbo.

Why this upgrade works

The stock paper insert is restrictive. This cotton gauze element increases surface area and reduces pressure drop, helping the turbo work more efficiently. The result is livelier low-end response, stronger mid-range and a cleaner intake tone while maintaining excellent filtration.

Care and maintenance

• Installs in minutes using basic hand tools
• Periodic clean and light re‑oil to maintain optimal flow and filtration

Professional fitting

Want it installed for you. Book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Important note

Not suitable for earlier BMW F-series applications. Those require part number MMR01-0502.

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Order today for an easy, affordable intake refresh that delivers every time you drive.