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Air Filters

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911901522
Product Information
Product Information
Pop off air valve.

Fits:
Porsche 911 1973-89

Prevents costly airbox explosions, installed with the engine and air box in place. 911 engines since 1973 have had the bad habit of backfiring and blowing a hole an the air box. 911 POP VALVE is installed inside the air box and when a backfire occurs the valve will instantly open and release the backfire pressure. The POP VALVE then automatically closes and the angine continues to run. The POP VALVE has no effect on the performance or fuel mileage.

CIS Pop Off Valve Installation Click Here

For Fitting Instructions CLICK HERE

Please note the glue is not included with the air valve.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

911901522
911901522
91111090699

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About Air Filters

Porsche Air Filters | Design911 Performance & Replacement Filters for Clean Engine Breathing

Air filters are essential for your Porsche’s performance, efficiency, and longevity. Designed to remove dust, pollen, and debris from incoming air, they ensure clean airflow to the engine for optimal combustion. A high-quality air filter not only improves power delivery and throttle response but also helps protect internal engine components from premature wear and damage.

At Design911, we supply a full range of air filters for both classic and modern models — including high-performance cotton gauze, pleated paper, and foam filters. Each filter is designed for precision fitment and maximum filtration efficiency. Whether you’re maintaining your daily driver or upgrading your Porsche for motorsport use, our filters deliver clean airflow, long service life, and reliable performance.

What Do Air Filters Do?

Air filters are a vital component of your Porsche’s intake system, providing clean, filtered air for efficient combustion and engine protection.

Core Functions:
• Filter out dust, dirt, and airborne contaminants from intake air.
• Maintain stable air-fuel ratios for smooth combustion.
• Protect pistons, valves, and cylinder walls from abrasive particles.
• Enhance throttle response and engine performance.
• Support optimal fuel economy and reduced emissions.

A well-maintained air filter ensures that your Porsche engine breathes efficiently — delivering consistent performance and reliability.

Why Do Air Filters Fail or Degrade?

Over time, air filters naturally clog with dirt and debris, reducing their ability to allow clean air into the engine.

Common Causes of Failure Include:
• Blockage from dust, pollen, and road debris buildup.
• Moisture or oil contamination in humid or dusty environments.
• Deterioration of filter media from age or heat exposure.
• Restricted airflow reducing performance and efficiency.
• Damage to seals allowing unfiltered air into the intake system.

A dirty or failing air filter can cause poor fuel economy, reduced power, increased emissions, and potential engine wear — making timely replacement essential.

Why Replace or Upgrade Your Porsche Air Filter?

Regular replacement or upgrading to a performance air filter ensures your Porsche continues to perform at its best, with clean, efficient airflow and maximum engine protection.

Key Benefits:
• Restores engine performance and responsiveness.
• Improves fuel efficiency and throttle sensitivity.
• Protects vital engine components from dust and contaminants.
• Available in reusable, high-performance, or replacement-grade options.
• Compatible with Porsche 911, 944, 968, Boxster, Cayman, Panamera, and Macan models.
• Ideal for regular maintenance, performance upgrades, or restoration projects.

Design911’s Porsche air filters combine engineering precision and superior materials for maximum performance, protection, and reliability on every drive.

Highlights

• Premium Porsche air filters for performance and protection.
• Available in paper, cotton, and high-flow sport materials.
• Exact-fit replacement for all Porsche models.
• Improves airflow, efficiency, and engine response.
• Perfect for regular servicing, performance tuning, or restoration.
• Resistant to heat, moisture, and environmental contamination.

How to Choose the Perfect Air Filter for Your Porsche #porsche #porscheupgrade

Today we’re talking air filters: the unsung heroes of your car’s engine. Why does your Porsche need one? Where can you find it? And, crucially, how do you know when it’s time for a replacement? It’s all here. We’ll unpack the options: classic paper filters (basic but effective); cotton gauze and foam alternatives (reusable & sustainable); and the pièce de résistance – air induction kits. The latter promises cooler, denser air for your engine: more oxygen, better combustion, and potentially, sharper performance.
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