Performance Air Filter for Porsche 911 (1973-1983)

Maximize Volumetric Efficiency for Your Porsche Air-Cooled Flat-Six with BMC High-Flow Filtration

Who It’s For: Designed specifically for Porsche 911 owners running the legendary Porsche Air-Cooled Flat-Six engine, from the late longhood 2.4L models to the iconic 3.0L SC.

The Problem: The Porsche Air-Cooled Flat-Six relies heavily on consistent, laminar airflow to maintain the delicate air-fuel balance required by mechanical injection and CIS (Continuous Injection System) setups. Stock paper filters are notorious for becoming restrictive as they age, effectively "choking" the engine during high-RPM pulls and increasing intake temperatures in an already heat-sensitive air-cooled environment.

The Solution: We utilize BMC’s Formula 1-derived "Full Moulding" technology to replace your restrictive factory element. This isn’t just a filter; it’s a precision-engineered performance component that corrects the airflow limitations of the Porsche Air-Cooled Flat-Six, allowing for a higher CFM (Cubic Feet per Minute) throughput while maintaining superior filtration via oil-soaked cotton gauze.

Why This is the Ultimate Upgrade

• F1-Grade Airflow: Engineered to provide a significantly higher flow rate than OEM paper filters, reducing pumping losses and improving throttle response across the powerband.
• Full Moulding Construction: The filter is produced in a single piece with no welded joints, ensuring the frame won’t crack or leak even when subjected to the extreme engine bay temperatures of an air-cooled Porsche.
• Washable & Reusable: Unlike disposable filters that end up in a landfill, this BMC element is fully regenerable using a standard wash and recoat kit, making it the last filter your 911 will ever need.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• Porsche 911 (1973) - T
• Porsche 911 (1974-1975)
• Porsche 911 (1976-1977) - S
• Porsche 911 (1978-1983)

Interchange Part Numbers:

91111018501, 91111018502, 42202, LX123, BMC-032-13

The Performance Promise

Buy with confidence. As specialists in air-cooled performance, we know that every extra CFM counts when you’re pushing a vintage Flat-Six toward redline. This BMC filter is the gold standard for enthusiasts who refuse to compromise on engine longevity or power.