What does the BMW B48 panel air filter upgrade improve?

The MMX BMW B48 panel air filter replaces the factory paper element with a multi-layer cotton gauze filter that flows more air with less restriction. The result is sharper throttle response, improved engine breathing, and a more pronounced induction character compared to the OEM paper filter — with no modification to the factory airbox required.

Does this BMW B48 panel air filter also fit the B48E engine?

Yes. The MMX filter is compatible with both the standard B48 and the higher-output B48E variant. This covers the BMW 128ti, F40 M135i, and F44 M235i on the BMW side, and the MINI Cooper JCW GP alongside the standard B48-powered MINI Cooper S, JCW, and Clubman JCW on the MINI side.

Is this compatible with the factory B48 airbox?

Yes. The MMX cotton panel filter is a direct drop-in for the factory B48 and B48E OEM airbox with no modifications required. It is not compatible with aftermarket intake systems that use a different filter housing format or cone filter arrangement.

Will fitting a performance panel filter affect my warranty?

A panel filter that fits within the factory airbox and meets OEM filtration standards is generally considered warranty-friendly. The MMX filter can be removed and the factory paper filter refitted at any time. Confirm with your dealer if warranty preservation is a priority before fitting.

How do I maintain the BMW B48 panel air filter?

The MMX cotton gauze filter is washable and reusable. Clean with a dedicated filter cleaning kit, allow to dry fully, re-oil lightly, and refit. Maintained correctly, the filter lasts the lifetime of the engine — a more cost-effective long-term alternative to replacing OEM paper filters at every service.

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Description

MMX Blue Cotton Panel Air Filter for F4x BMW 128ti, M135i, M235i and F5x MINI Cooper S, JCW, JCW GP (B48 / B48E Engine)

BMW B48 panel air filter from MMX Performance is a direct drop-in cotton gauze replacement for the factory paper filter in the OEM airbox, covering F4x BMW 128ti, M135i, and M235i with the B48E engine, and F5x MINI Cooper S, JCW, JCW GP, and Clubman JCW with the B48 and B48E. The multi-layer cotton gauze element flows more air than the standard paper filter with less restriction, improving engine breathing, sharpening throttle response, and enhancing induction character all without requiring any modification to the factory airbox or intake system. Built to OEM standards for fit, filtration quality, and durability, the filter is fully washable and reusable, lasting the lifetime of the engine and making it a more cost-effective long-term alternative to disposable OEM paper replacements. A warranty-friendly first performance upgrade for any B48 or B48E-powered BMW or MINI, installable in approximately 10 minutes.

Features

Direct drop-in replacement for the OEM paper panel air filter; no airbox modifications required
Multi-layer cotton gauze construction for improved airflow and filtration
Improves engine breathing, throttle response, and induction character
Compatible with B48 and B48E OEM airbox
Washable and reusable; lasts the lifetime of the engine
Built to OEM standards for fit, filtration quality, and durability
Warranty-friendly; easily returned to standard
Installs in approximately 10 minutes

Applications

BMW 128ti: F40 | 2020-2024
BMW M135i: F40 | 2020-2024
BMW M235i: F44 | 2020-2024
MINI Clubman JCW: F54 | 2015-2024
MINI Cooper JCW: F55, F56, F57 | 2015-2024
MINI Cooper JCW GP: F56 | 2020
MINI Cooper S: F55, F56, F57 | 2015-2024

Notes

Compatible with B48 and B48E OEM airbox only. Not compatible with aftermarket intake systems using a different filter housing.
Direct replacement for the OEM panel air filter; no modifications required
Sold as a single filter

Frequently Asked Questions

What does the BMW B48 panel air filter upgrade improve? The MMX BMW B48 panel air filter replaces the factory paper element with a multi-layer cotton gauze filter that flows more air with less restriction. The result is sharper throttle response, improved engine breathing, and a more pronounced induction character compared to the OEM paper filter with no modification to the factory airbox required.
Does this BMW B48 panel air filter also fit the B48E engine? Yes. The MMX filter is compatible with both the standard B48 and the higher-output B48E variant. This covers the BMW 128ti, F40 M135i, and F44 M235i on the BMW side, and the MINI Cooper JCW GP alongside the standard B48-powered MINI Cooper S, JCW, and Clubman JCW on the MINI side.
Is this compatible with the factory B48 airbox? Yes. The MMX cotton panel filter is a direct drop-in for the factory B48 and B48E OEM airbox with no modifications required. It is not compatible with aftermarket intake systems that use a different filter housing format or cone filter arrangement.
Will fitting a performance panel filter affect my warranty? A panel filter that fits within the factory airbox and meets OEM filtration standards is generally considered warranty-friendly. The MMX filter can be removed and the factory paper filter refitted at any time. Confirm with your dealer if warranty preservation is a priority before fitting.
How do I maintain the BMW B48 panel air filter? The MMX cotton gauze filter is washable and reusable. Clean with a dedicated filter cleaning kit, allow to dry fully, re-oil lightly, and refit. Maintained correctly, the filter lasts the lifetime of the engine a more cost-effective long-term alternative to replacing OEM paper filters at every service.

About MMX Performance

MMX Performance is a UK-based specialist in performance parts for BMW and MINI vehicles, crafting high-quality upgrades that blend precision engineering, rigorous testing, and motorsport heritage. Driven by enthusiast culture, MMX designs its products in the UK and puts them through track validation to ensure durability, fitment accuracy, and on-road performance. Their catalog spans drivetrain components, spacers, hardware, and chassis enhancements, all tailored to elevate both the driving experience and visual appeal of BMW and MINI models.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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MMX Blue Cotton Replacement Panel Air Filter for F4x BMW 128ti, M135i, and M235i | F5x MINI Cooper JCW, JCW GP, and S (with B48 and B48E engines) [MMR01-1302/MMR01-0901]

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MMX Blue Cotton Panel Air Filter for F4x BMW 128ti, M135i, M235i and F5x MINI Cooper S, JCW, JCW GP (B48 / B48E Engine)

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Frequently Asked Questions

About MMX Performance

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