GReddy 12500601 AIRINX S Universal High-Flow Air Filter – 50mm / 60mm

GReddy 12500601 Technical Specifications

Why GReddy’s Three-Layer Filtration Design Matters

An engine air filter has two essential jobs: allowing sufficient intake airflow and helping prevent airborne contaminants from entering the engine.

The GReddy AIRINX S uses a three-layer structure combining high-performance fiber filtration media with steel mesh reinforcement.

The steel mesh supports the filter’s shape, while the fiber material provides the filtration surface.

This construction is intended to deliver intake performance without sacrificing the filter’s structural integrity.

The molded polyurethane top, base, and inlet are integrated with the filter element to improve flexibility and durability.

For enthusiasts running custom intake piping or compact turbocharger inlet arrangements, this construction provides an alternative to conventional aftermarket cone filters.

Inverted-Top Design for Additional Filtration Area

One of the distinguishing features of the AIRINX S is its inverted-top filtration surface.

Rather than using a completely closed filter end, GReddy incorporates an additional filtering surface at the top of the assembly.

This increases the usable surface area available for incoming air.

The design is particularly useful for a compact filter because overall filter size is limited by engine-bay packaging.

The AIRINX S measures approximately 140mm tall, with a 122mm top diameter and 145mm bottom diameter.

These dimensions make it important to check clearance around the radiator, battery, hood, and nearby engine components before installation.

Designed for 50mm and 60mm Custom Intake Systems

The GReddy 12500601 is designed around 50mm and 60mm intake connections.

It is suitable for custom installations using compatible intake tubing, adapters, or turbocharger inlet plumbing.

However, matching the inlet diameter is only the first part of determining compatibility.

You should also verify:

• Available clearance around the filter
• Proper intake pipe support
• Compatible clamps and adapters
• Airflow sensor positioning
• Engine-bay heat exposure
• Protection from water and road debris
• Adequate airflow capacity for the engine

For detailed installation guidance, read our How to Install Cold Air Intake the Right Way, which explains filter placement, intake piping, sensor handling, and common installation mistakes.

A Compact Air Filter for Turbocharged Builds

On a turbocharged engine, the intake system must provide air to the compressor inlet without unnecessary restriction.

A poorly sized filter, collapsed intake hose, or restrictive adapter can limit airflow before it even reaches the turbocharger.

The GReddy AIRINX S provides a compact universal filter option for builds with compatible 50mm or 60mm intake connections.

It can be used as part of a properly designed turbocharger intake system, but it is not a complete turbo inlet kit.

Depending on the engine, additional intake piping, airflow meter adapters, breather connections, and mounting hardware may be necessary.

Our Complete Street Turbo Build Guide explains how intake sizing, turbocharger selection, intercooling, and engine tuning work together.

Important: GReddy warns that improved intake efficiency can alter the air-fuel ratio. Verify fueling and engine calibration after installation, particularly on modified turbocharged vehicles.

Dry Filter Maintenance: No Filter Oil Required

The AIRINX S uses a dry filtration element, so it does not require oiling after cleaning.

GReddy recommends cleaning with water and a small amount of mild neutral detergent.

Avoid aggressive industrial cleaners that may damage the filter materials.

Allow the filter to dry completely before reinstalling it.

Compressed air may be used carefully for intermediate cleaning when consistent with the manufacturer’s instructions.

Filter service frequency depends on driving conditions, dust exposure, and the condition of the filter element.

Inspect the filter regularly, especially on vehicles driven in dusty environments or used for motorsports.

GReddy AIRINX S vs. AIRINX M

GReddy offers different AIRINX sizes to accommodate various intake systems.

The 12500601 is the appropriate AIRINX S variant for compatible 50mm or 60mm intake connections.

For larger intake tubing, choose the corresponding GReddy filter size rather than forcing an incompatible adapter.

Vehicle Fitment – What Cars Does GReddy 12500601 Fit?

The GReddy AIRINX S 12500601 is a universal aftermarket intake filter, not a vehicle-specific replacement part.

It may be incorporated into custom intake systems on many different vehicles, including Japanese performance platforms such as Honda Civic, Acura Integra, Nissan 240SX, Mazda Miata, and Mitsubishi Lancer Evolution.

However, these are examples of vehicles commonly modified with aftermarket intake systems, not confirmed direct-fit applications.

Compatibility depends on the installed intake pipe, available space, airflow sensor arrangement, and the engine’s airflow requirements.

For your vehicle fitment database, classify this product as:

Universal Fitment – 50mm / 60mm Intake Connection – Modification May Be Required.

Installation Considerations

Before installation, measure the intake connection and confirm the correct adapter configuration.

Position the filter away from excessive exhaust heat and moving engine components.

Ensure the filter is securely attached and cannot contact belts, pulleys, cooling fans, or the hood.

If the vehicle uses a mass airflow sensor, preserve the correct sensor housing, orientation, and intake plumbing configuration.

A universal filter alone does not provide the correct MAF housing for every vehicle.

After installation, inspect all connections and verify engine operation.

If the vehicle experiences unstable idle, abnormal fuel trims, or a check-engine light, inspect the intake system and confirm that the air-fuel ratio remains within the engine’s required operating range.

Frequently Asked Questions

What vehicles fit the GReddy 12500601?

It is a universal filter for compatible 50mm or 60mm custom intake systems. It does not have a manufacturer-confirmed direct-fit year/make/model list.

Does it fit a Nissan 240SX?

It may fit a custom 240SX intake using compatible 50mm or 60mm piping, but it is not a direct-fit factory airbox replacement.

Does it fit a Honda Civic or Acura Integra?

It can be used with a properly sized custom intake system, subject to clearance and sensor compatibility.

Can it be used on a turbocharged engine?

Yes. GReddy describes the AIRINX range as suitable for naturally aspirated and forced-induction applications.

Does it require filter oil?

No. The AIRINX S is a dry-element air filter.

Can the filter be washed?

Yes. GReddy recommends mild neutral detergent and water, followed by complete drying.

Does it increase horsepower?

A less restrictive intake system may support improved airflow, but GReddy does not publish a guaranteed horsepower increase for this universal filter.

Does it include a complete cold air intake kit?

No. It is a universal filter assembly with a compatible inlet adapter, not a vehicle-specific intake piping kit.

Is it street legal in California?

No CARB Executive Order exemption was confirmed for this universal filter. Check the requirements applicable to your vehicle before installing it on a pollution-controlled road vehicle.

Upgrade Your Custom Intake With GReddy AIRINX S

The GReddy 12500601 AIRINX S Universal Air Filter combines compact dimensions, durable polyurethane construction, dry filtration media, and a high-flow inverted-top design.

For enthusiasts building a compatible 50mm or 60mm intake system, it offers genuine GReddy engineering and reusable filtration without requiring an oiled filter element.

Choose the GReddy 12500601 AIRINX S for your next custom intake build when your installation calls for a compact 50mm or 60mm dry-element performance air filter.