Performance Air Filter for Porsche 944 (1985-1991) with 2.5 I4 Turbo Engine

Optimize the M44 Turbo: High-Flow Induction for the Porsche 944 (951)

Who It’s For: Engineered for Porsche 944 Turbo owners running the M44/51 and M44/52 powerplants who want to sharpen throttle response and improve turbo spool-up without modifying the factory airbox.

The Symptom: The Porsche 951 chassis was a marvel of 1980s engineering, but the factory air filtration relies on thick, restrictive paper elements designed more for service intervals than performance. This traditional paper media creates a significant pressure drop across the filter, forcing the turbocharger to work harder to pull air through the intake tract. On a vintage turbo setup, this translates to increased lag and a feeling of the engine being choked during high-RPM pulls where air demand is at its peak.

The Engineering Fix: This BMC performance filter replaces the restrictive paper with four layers of long-staple cotton gauze, soaked in a low-viscosity oil. This specific configuration utilizes fluid dynamics to catch impurities as small as 7 microns through "interception" and "diffusion" without obstructing the airflow path. By reducing the resistance at the entry point of the intake, you allow the turbocharger to reach target boost more efficiently, resulting in a more linear power band and a noticeable increase in oxygen density for the combustion chamber.

Why Mechanics Choose This Kit

• Superior Filtration: Captures particles down to 7 microns, compared to the 10-micron limit of most standard OEM paper filters, ensuring the internal components of your M44 remain protected.
• Full Moulding Construction: Unlike cheaper filters that use glued joints prone to cracking under heat, this unit is built from a single mould to ensure structural integrity within the 944’s compact engine bay.
• Regenerative Design: This is a lifetime component. Using a BMC washing kit, you can clear the trapped particulates and re-oil the media, maintaining peak flow rates for the life of the vehicle.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 1985-1988 Porsche 944 2.5 I4 Turbo (951) - 220HP
• 1988 Porsche 944 2.5 I4 Turbo (951) S - 250HP
• 1989-1991 Porsche 944 2.5 I4 Turbo (951) Coupé - 250HP
• 1990-1991 Porsche 944 2.5 I4 Turbo (951) Convertible - 250HP

Interchange Part Numbers:

FB766/01, FB76601

The Performance Promise

Buy with confidence. We understand the specific needs of the transaxle Porsche community. This filter provides the perfect balance of increased airflow for performance and high-micron filtration for long-term engine health. Backed by real automotive experts and fast shipping.