MMX Cotton panel air filter | BMW F2x & F3x | B58 | B48

MMX Cotton Panel Air Filter – BMW F2X & F3X B58 / B48

Improve airflow through the factory intake system of your B58- or B48-powered BMW with the MMX Cotton Panel Air Filter.

Designed as a direct replacement for the standard paper air filter, the MMX high-flow cotton filter fits inside the original BMW airbox, allowing you to improve intake airflow and induction character without replacing the complete factory intake system.

It is a simple, effective and reversible upgrade for BMW F2X and F3X models including the M140i, M240i, 340i and 440i, as well as compatible B48-powered applications.

Why Upgrade the Factory Air Filter?

The standard BMW paper filter is designed around a balance of filtration, refinement, servicing requirements and manufacturing cost.

For performance-focused applications, a higher-flow replacement panel filter can reduce restriction at the beginning of the intake system while keeping the factory airbox in place.

The MMX cotton filter is designed to provide:

• Improved airflow
• Reduced intake restriction
• Enhanced induction sound
• Washable and reusable construction
• Direct OEM-style fitment
• Retention of the factory airbox
• Simple installation
• Fully reversible fitment

Key Features

• MMX high-flow cotton panel air filter
• Designed for BMW F2X and F3X applications
• Compatible with B58 engines
• Compatible with B48 engines
• Direct replacement for the factory paper filter
• Fits inside the original BMW airbox
• High-flow cotton gauze construction
• Washable and reusable
• Designed to improve intake airflow
• Helps reduce intake restriction
• Enhanced induction sound
• Retains factory cold-air feed
• Retains OEM airbox
• Factory-style fitment
• Suitable for standard and tuned vehicles
• Ideal as a first intake upgrade

High-Flow Cotton Gauze Construction

The MMX filter replaces the restrictive disposable paper filtration element with a performance-oriented cotton gauze design.

Cotton gauze can allow air to pass through the filter more freely while continuing to provide effective filtration for the engine.

MMX develops its panel filters to combine increased airflow with OEM-style fit and construction.

This makes the filter particularly well suited to enthusiast-owned cars where increased airflow is desirable without completely replacing the factory induction system.

Improved Airflow

Turbocharged BMW B58 and B48 engines rely on a consistent supply of intake air.

As engine load, boost and power increase, restrictions within the intake path become increasingly important.

The MMX Cotton Panel Air Filter improves the first stage of this airflow path by replacing the more restrictive standard paper element.

This can complement modifications such as:

• ECU tuning
• Increased boost
• Performance intake hoses
• Chargepipe upgrades
• Turbo inlet upgrades
• Performance exhaust systems
• Other supporting engine modifications

Retains the Factory Airbox

One of the biggest advantages of a panel filter upgrade is that the original BMW airbox remains fitted.

This allows the car to retain:

• Factory cold-air ducting
• OEM airbox positioning
• Original engine-bay layout
• Factory-style heat isolation
• Simple servicing access

For road and fast-road cars, this can provide an excellent balance between performance and refinement.

Enhanced Induction Sound

The MMX filter can also allow more of the engine's natural induction character to be heard.

The sound increase is typically more subtle than fitting a complete open-filter intake system.

Depending on the vehicle and supporting modifications, drivers may notice:

• Increased induction sound
• More audible turbo spool
• Greater airflow character under acceleration

while retaining a largely OEM-style intake arrangement.

Washable & Reusable

Unlike the standard disposable paper element, the MMX cotton filter is designed to be cleaned and reused.

This makes it particularly attractive for enthusiast-owned vehicles that are regularly serviced and maintained.

Correct cleaning procedures and suitable filter-care products should always be used to maintain filtration and airflow performance.

Ideal First Intake Upgrade

For owners who do not want to replace the complete intake system, the MMX panel filter is one of the simplest upgrades available.

It requires:

• No replacement airbox
• No major engine-bay changes
• No permanent vehicle modification
• Minimal installation complexity

This makes it especially suitable for standard and lightly modified road cars.

Suitable for Tuned B58 Engines

The B58 responds extremely well to performance tuning.

As engine output increases, airflow demand also rises.

The MMX panel filter can therefore form part of a broader B58 performance package alongside upgrades such as:

• MMX Silicone Intake Hose
• MMX Performance Intake Kit
• MMX Chargepipe Kit
• ECU tuning
• Performance exhaust systems

For owners retaining the factory airbox, the panel filter provides a straightforward way to reduce one potential intake restriction.

Suitable for B48 Applications

The same filter is also listed by MMX for compatible B48-powered F2X and F3X BMWs.

This makes it suitable for a wide range of turbocharged four-cylinder BMW applications where the same airbox/filter arrangement is used.

For B48-powered cars, it provides the same core benefits:

• Improved airflow
• Reusable construction
• Factory airbox retention
• Enhanced induction character

Panel Filter vs Standard Paper Filter

The standard paper filter prioritises:

• Long service intervals
• Factory refinement
• Low manufacturing cost
• Broad operating conditions

The MMX cotton panel filter prioritises:

• Increased airflow
• Reusability
• Performance-oriented intake efficiency
• Enhanced induction sound

For an enthusiast-owned BMW, this provides a simple way to improve the factory intake system without replacing it completely.

Panel Filter vs Complete Intake System

A complete aftermarket intake can create a larger change in airflow and induction sound, but it also replaces more of the original intake hardware.

The MMX panel filter is better suited to owners who want:

• OEM airbox retention
• Subtle sound improvement
• Simple installation
• Lower cost
• Factory-style appearance

A full intake system may be more appropriate for owners targeting larger airflow gains or a significantly more aggressive induction note.

Ideal with the MMX Silicone Intake Hose

On compatible B58 models, the MMX Cotton Panel Air Filter works particularly well alongside the MMX Silicone Intake Hose.

The panel filter improves airflow through the factory airbox, while the smooth-flowing silicone hose removes the corrugated factory intake section further downstream.

Together, these provide a more comprehensive factory-airbox-based intake upgrade.

BMW F20 / F21 M140i

The MMX Cotton Panel Air Filter is compatible with B58-powered BMW F20 and F21 M140i models.

For standard or tuned M140i builds, it provides a simple way to improve airflow while retaining the original BMW airbox.

BMW F22 / F23 M240i

The filter is suitable for the BMW F22 M240i Coupe and F23 M240i Convertible.

It can be used alone or alongside supporting B58 intake and tuning upgrades.

BMW F30 / F31 340i

The MMX panel filter is compatible with B58-powered BMW F30 340i and F31 340i Touring models.

For fast-road and tuned 340i builds, it offers a simple reduction in intake restriction without replacing the complete factory intake.

BMW F32 / F33 / F36 440i

The filter is also suitable for compatible B58-powered 440i applications including:

• BMW F32 440i Coupe
• BMW F33 440i Convertible
• BMW F36 440i Gran Coupe

B48-Powered BMW F2X & F3X Models

MMX also lists the filter for compatible B48-powered BMW F2X and F3X applications.

Exact model fitment should always be confirmed before ordering, particularly where different airbox designs or model-year changes may apply.

Compatibility

Designed for compatible BMW F2X and F3X models with:

• BMW B58 engine
• BMW B48 engine

Key B58 applications include:

• 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

Also suitable for applicable B48-powered F2X and F3X models using the corresponding factory airbox.

Please confirm exact vehicle and engine specification before ordering.

What's Included?

The MMX Cotton Panel Air Filter package includes:

• MMX high-flow cotton gauze panel air filter

The original BMW airbox and surrounding intake hardware are retained.

Explore More BMW B58 & B48 Performance Parts

Looking to improve your BMW intake system further? Explore our range of induction and performance upgrades.

BMW F20 / F21 M140i Parts – Shop intake, suspension and performance upgrades for the BMW M140i.

BMW F22 / F23 M240i Parts – Browse B58 engine and performance products for the BMW M240i.

BMW F3X Parts – Explore intake and performance upgrades for the BMW 3/4 Series

MMX Performance – Explore MMX intake, engine, suspension and drivetrain upgrades.

Induction – Browse panel filters, intake kits, intake hoses and supporting airflow upgrades.

Please select required engine variant below.