What does the MMX BMW B58 air intake improve over the factory airbox?

The MMX BMW B58 air intake replaces the restrictive factory airbox with a dual-entry high-flow cotton gauze filter and bell-mouth pipework that feeds the turbo with a larger, unrestricted volume of cool air. The result is improved throttle response, better turbo efficiency, and a more engaging induction and turbo spool sound that the OEM airbox deliberately suppresses.

Does the kit include a heat shield?

Yes. The MMX BMW B58 air intake includes a dedicated heat shield that retains the OEM cold-air feed and isolates the filter and pipework from heat radiated by the turbo and exhaust manifold. This protects the intake air temperature advantage and ensures consistent performance under sustained hard use.

Will NVH increase after fitting?

No. The billet aluminum mounting brackets are fitted with rubber isolators that manage engine movement and minimize any additional NVH introduced by removing the OEM airbox. The intake is engineered for real-world use, not track-only applications.

Is this compatible with the MMX silicone intake hose?

Yes. The MMX B58 air intake is designed to pair with the MMX silicone intake hose for a complete staged induction upgrade. The silicone hose replaces the factory bellows between the airbox outlet and the turbo inlet, ensuring the full performance benefit of the intake system is delivered to the turbo without restriction.

Does installation require cutting or modification?

No. The MMX BMW B58 air intake kit is a fully reversible installation using existing mounting points and factory connections. No cutting, drilling, or permanent modification is required.

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Description

MMX Air Intake Kit for Fxx BMW M140i, M240i, 340i, and 440i (B58 Engine)

BMW B58 air intake kit from MMX Performance is a complete induction upgrade for the F-series M140i, M240i, 340i, and 440i, developed to replace the restrictive factory airbox with a system engineered for improved airflow, sharper induction acoustics, and a cleaner engine bay. The kit is built around a dual-entry high-flow cotton gauze air filter and a precision-machined aluminum bell-mouth that feeds the turbo an unrestricted column of air. A dedicated heat shield retains the OEM cold-air feed and isolates the intake from heat generated by the turbo and exhaust manifold, ensuring the airflow temperature advantage is preserved under sustained hard use. Billet aluminum mounting brackets with rubber isolators manage engine movement and minimize NVH, while real carbon fiber support rods and laser-etched MMX branding complete the engine bay presentation. Finished in MMX’s proprietary anodized coating throughout, the kit installs without cutting or permanent modification and is fully reversible.

Features

Dual-entry high-flow cotton gauze air filter in MMX blue
Precision-machined aluminum bell-mouth for unrestricted turbo feed
Heat shield retains OEM cold-air feed and isolates intake from turbo and exhaust heat
Billet aluminum mounting brackets with rubber isolators to manage engine movement and minimize NVH
Carbon fiber support rods for structural integrity and visual appeal
MMX proprietary anodized black finish throughout
Laser-etched MMX logo
Improved engine performance and enhanced induction noise
No cutting or permanent modification required; fully reversible

Applications

BMW 340i: F30, F31, F34 | 2015-2019
BMW 440i: F32, F33, F36 | 2016-2019
BMW M140i: F20, F21 | 2016-2019
BMW M240i: F22, F23 | 2016-2021

Notes

Compatible with B58 engines only. Does not fit B48 or other engine variants.
Sold as a complete kit with all hardware included

Frequently Asked Questions

What does the MMX BMW B58 air intake improve over the factory airbox? The MMX BMW B58 air intake replaces the restrictive factory airbox with a dual-entry high-flow cotton gauze filter and bell-mouth pipework that feeds the turbo with a larger, unrestricted volume of cool air. The result is improved throttle response, better turbo efficiency, and a more engaging induction and turbo spool sound that the OEM airbox deliberately suppresses.
Does the kit include a heat shield? Yes. The MMX BMW B58 air intake includes a dedicated heat shield that retains the OEM cold-air feed and isolates the filter and pipework from heat radiated by the turbo and exhaust manifold. This protects the intake air temperature advantage and ensures consistent performance under sustained hard use.
Will NVH increase after fitting? No. The billet aluminum mounting brackets are fitted with rubber isolators that manage engine movement and minimize any additional NVH introduced by removing the OEM airbox. The intake is engineered for real-world use, not track-only applications.
Is this compatible with the MMX silicone intake hose? Yes. The MMX B58 air intake is designed to pair with the MMX silicone intake hose for a complete staged induction upgrade. The silicone hose replaces the factory bellows between the airbox outlet and the turbo inlet, ensuring the full performance benefit of the intake system is delivered to the turbo without restriction.
Does installation require cutting or modification? No. The MMX BMW B58 air intake kit is a fully reversible installation using existing mounting points and factory connections. No cutting, drilling, or permanent modification is required.

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 Air Intake Kit for Fxx BMW M140i, M240i, 340i, and 440i (with B58 engine) [MMR11-0502FK]

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MMX Air Intake Kit for Fxx BMW M140i, M240i, 340i, and 440i (B58 Engine)

Features

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Notes

Frequently Asked Questions

About MMX Performance

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