MMX Intake Kit Inc Heat Sheild | M140I

MMX Intake Kit with Heat Shield – BMW F20/F21 M140i B58

Transform the induction sound and airflow of your BMW M140i with the MMX Performance Intake Kit with Heat Shield.

Designed specifically around the B58 engine, the MMX intake replaces the restrictive factory airbox with a high-flow dual-entry cotton gauze filter, aluminium bell-mouth intake and dedicated heat shield designed to retain the original BMW cold-air feed.

The result is a performance-focused intake system that increases airflow, enhances induction and turbo sound and gives the M140i engine bay a much more purposeful appearance.

For standard and tuned B58-powered cars alike, the MMX intake provides a comprehensive cold-air intake solution with OEM-quality fitment and a fully reversible installation.

Why Upgrade the M140i Intake?

As engine power and boost increase, the amount of air required by the B58 also rises.

The factory airbox is designed around a balance of:

• Noise reduction
• Packaging
• Manufacturing cost
• Filtration
• Everyday refinement

MMX takes a more performance-focused approach.

By replacing the original airbox with a large high-flow filter and smooth bell-mouth entry, the intake is designed to reduce restriction and allow the turbocharger to draw air more efficiently.

Key Features

• MMX Performance intake kit
• Developed for BMW B58-powered F-Series models
• Ideal for BMW F20/F21 M140i
• High-flow dual-entry cotton gauze filter
• Aluminium bell-mouth intake design
• Dedicated intake heat shield
• Retains the factory cold-air feed
• Helps isolate intake air from engine-bay heat
• Increased airflow
• Enhanced induction sound
• Improved turbo sound
• Supports higher-performance B58 builds
• Billet aluminium mounting brackets
• Rubber-isolated mounting system
• Real carbon-fibre support rods
• Durable anodised finish
• Stainless-steel hose clips
• Complete installation hardware supplied
• No cutting or permanent modification required
• Fully reversible installation
• MMX part number MMR11-0502FK

High-Flow Dual-Entry Air Filter

At the centre of the MMX intake is a large dual-entry cotton gauze air filter.

Unlike a conventional filter that draws air through a single outer surface, the dual-entry design provides an additional airflow path through the end of the filter.

This increases the available filtration surface and helps reduce restriction as airflow demand rises.

For tuned B58 applications in particular, providing the turbocharger with a less restrictive intake path can become increasingly valuable.

Cotton Gauze Construction

The MMX filter uses a performance-oriented cotton gauze element.

This provides a higher-flow alternative to the conventional paper filtration used within the original BMW airbox.

The filter is designed to balance:

• High airflow
• Effective filtration
• Performance use
• Reusability

This makes it suitable for both standard road cars and modified B58 builds.

Aluminium Bell-Mouth Intake

The high-flow filter feeds into an aluminium bell-mouth intake design.

A bell-mouth provides a smooth, radiused transition into the intake pipe rather than forcing incoming air through a sharp-edged opening.

This helps encourage smoother airflow into the intake system and reduce turbulence as the air enters the pipework.

The design is particularly useful at higher airflow rates, where poor transitions can become increasingly restrictive.

Dedicated Heat Shield

A properly designed open-filter intake needs to consider engine-bay temperature as well as airflow.

The MMX kit includes a dedicated aluminium heat shield surrounding the intake filter.

This helps separate the filter from heat generated by:

• The turbocharger
• Exhaust manifold
• Engine
• Surrounding engine-bay components

The objective is to provide the filter with a more consistent supply of cooler intake air.

Retains the Factory Cold-Air Feed

Rather than simply placing an exposed filter within the engine bay, the MMX heat shield is designed to retain the original BMW cold-air entry feed.

Fresh external air is therefore directed into the shielded intake area.

This helps combine the airflow and sound benefits of an open performance filter with improved protection from surrounding engine-bay heat.

Increased Induction Sound

One of the most noticeable changes after fitting the MMX intake is the sound.

Removing the enclosed factory airbox allows considerably more of the B58's natural induction and turbocharger noise to be heard.

Under acceleration, drivers can expect a more pronounced:

• Induction roar
• Turbo spool
• Airflow sound
• Turbocharger character

For many M140i owners, this is one of the biggest reasons to upgrade the intake system.

Improved Airflow

MMX designed the intake to remove restrictions associated with the original airbox.

The combination of:

• Large dual-entry filter
• Bell-mouth entry
• High-flow design
• Smooth transitions

helps improve airflow toward the turbocharger.

This can be particularly valuable on cars with increased engine output.

Supports Tuned B58 Engines

The B58 responds extremely well to tuning and supporting modifications.

As boost and engine output rise, reducing restriction before the turbocharger can help support increased airflow demand.

The MMX intake is therefore particularly well suited to:

• Standard B58 engines
• Stage 1 tuned cars
• Stage 2 builds
• Upgraded exhaust systems
• Higher-boost setups
• Hybrid turbo applications
• Fast-road builds

For higher-output engines, the intake can form part of a broader package of supporting airflow upgrades.

Improved Engine-Bay Appearance

The MMX intake is also designed to provide a substantial visual improvement.

The kit incorporates:

• Anodised aluminium components
• Billet aluminium support brackets
• Carbon-fibre support rods
• Black performance filter
• Purpose-designed heat shielding

This gives the B58 engine bay a more performance-focused appearance while retaining a high-quality, engineered finish.

Billet Aluminium Mounting Brackets

MMX uses billet aluminium mounting hardware rather than basic folded brackets.

This provides a stronger and more premium installation while maintaining accurate positioning of the intake assembly.

Rubber-Isolated Mounting System

The intake uses rubber-mounted billet fixing points.

The B58 engine moves within its mounts as torque is applied.

A completely rigid intake mounting system could transfer this movement and vibration into the intake hardware or vehicle structure.

MMX uses rubber isolation to provide the necessary compliance.

This helps:

• Allow normal engine movement
• Reduce stress on intake components
• Limit unwanted vibration
• Reduce transmission of NVH into the cabin

Carbon-Fibre Support Rods

Real carbon-fibre support rods are used as part of the intake mounting arrangement.

These provide additional support while contributing to the premium engine-bay appearance of the system.

The combination of billet hardware and carbon-fibre detailing separates the MMX kit from simpler open-filter intake conversions.

Intake Kit vs Panel Filter

A replacement panel filter retains the entire original airbox.

This is ideal for owners wanting:

• Minimal modification
• Subtle sound changes
• OEM appearance
• Lower cost

The MMX Intake Kit goes considerably further.

It replaces the factory airbox with a larger open-filter arrangement and dedicated heat shield, providing:

• Greater induction sound
• Increased airflow potential
• More substantial engine-bay changes
• Better support for higher-output builds

Intake Kit vs Silicone Intake Hose

The MMX Silicone Intake Hose upgrades the factory pipe between the airbox and turbo inlet.

It can be used while retaining the original BMW airbox.

The complete MMX intake replaces the airbox itself and provides a high-flow filter and bell-mouth arrangement.

For a more comprehensive B58 intake system, the two upgrades can be combined.

Ideal with the MMX Silicone Intake Hose

MMX also offers its smooth-flowing B58 silicone intake hose for the M140i.

The hose replaces the restrictive factory plastic bellows pipe between the intake and turbo inlet.

Combining it with the MMX Intake Kit creates a smoother airflow path from the high-flow filter toward the turbocharger.

Easy & Reversible Installation

The MMX intake is designed as a straightforward bolt-on installation.

No cutting or permanent vehicle modification is required.

The kit includes the necessary:

• Stainless-steel hose clips
• Mounting brackets
• Support hardware
• Heat shield components
• Intake hardware

Because the installation is reversible, the original factory intake system can be refitted later if required.

Ideal for Road & Fast-Road Builds

The MMX Intake Kit is particularly well suited to:

• Daily-driven M140i models
• Fast-road builds
• Tuned B58 cars
• Weekend performance vehicles
• Occasional track cars
• Owners wanting increased induction sound

Its combination of improved airflow and enhanced sound makes it one of the most noticeable engine upgrades available without altering internal engine components.

BMW F20 M140i

The MMX Intake Kit is compatible with the BMW F20 M140i powered by the B58 engine.

It provides increased intake sound and airflow while retaining the factory cold-air feed through the MMX heat-shield design.

BMW F21 M140i

The BMW F21 M140i is also supported.

The same complete intake arrangement replaces the factory airbox with the MMX dual-entry high-flow filter and bell-mouth assembly.

Additional B58 Fitment

Although commonly marketed as the MMX M140i Intake Kit, MMX also officially lists compatibility with other B58-powered F-Series models including:

• BMW F22 M240i
• BMW F23 M240i Convertible
• BMW F30 340i
• BMW F31 340i Touring
• BMW F32 440i
• BMW F33 440i Convertible
• BMW F36 440i Gran Coupe

This makes the intake suitable for a wider range of first-generation B58 F-Series BMWs.

Compatibility

Designed for compatible B58-powered BMW F2X and F3X applications from approximately 2016 onward, including:

• BMW F20 M140i
• BMW F21 M140i
• BMW F22 M240i
• BMW F23 M240i Convertible
• BMW F30 340i
• BMW F31 340i Touring
• BMW F32 440i
• BMW F33 440i Convertible
• BMW F36 440i Gran Coupe

Engine:

• BMW B58

Please confirm exact vehicle and engine specification before ordering.

What's Included?

The MMX B58 Intake Kit includes:

• MMX dual-entry high-flow cotton gauze filter
• Aluminium bell-mouth intake
• MMX intake heat shield
• Billet aluminium mounting brackets
• Rubber isolators
• Real carbon-fibre support rods
• Stainless-steel hose clips
• Required installation hardware

Supplied as a complete intake kit.

Explore More BMW M140i Performance Parts

Looking to improve your B58-powered BMW further? Explore our range of engine and chassis upgrades.

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