K&N 33-2640 High-Flow Replacement Air Filter for 1986-1988 Porsche 944 S 2.5L L4

Vehicle Fitment

• 1986-1988 Porsche 944 S (2.5L L4, Fuel Injected)

Fitment Notes

• Application is specific to the 944 S trim (2.5L 16-valve engine) - does not cover the standard 944 (2.5L 8-valve), 944 Turbo, or 944 S2 (3.0L), which use different air filter dimensions.

Features

• Engineered to increase horsepower and acceleration versus a stock paper filter
• Washable and reusable cotton gauze media designed to last the lifetime of the vehicle
• Four layers of oiled cotton gauze construction for high airflow with strong contaminant capture
• Rugged, durable construction built to withstand repeated cleaning and reuse
• Only needs cleaning approximately every 75,000 miles / 5 years under normal highway driving
• Reusable design reduces long-term cost versus repeatedly buying disposable filters
• Backed by K&N's No-Hassle Lifetime Limited Warranty
• Pre-oiled, drop-in design installs directly into the factory air box with no modification
• Filters up to 99% efficiency while maintaining high airflow
• Helps reduce landfill waste generated by disposable paper air filters

Specifications

• Shape: Panel
• Media Material: Cotton Gauze
• Washable: Yes
• Outside Length: 18.813 in (478 mm)
• Outside Width: 5.688 in (144 mm)
• Height: 1.188 in (30 mm)
• Filtration Efficiency: Up to 99%
• Warranty: No-Hassle Lifetime Limited

Included Components

• 1x K&N 33-2640 Panel Air Filter

Product Description

The K&N 33-2640 is a direct-fit replacement panel air filter engineered specifically for the 1986-1988 Porsche 944 S with its 2.5L fuel-injected inline-four. It uses K&N's signature layered cotton gauze media to deliver noticeably higher airflow than the factory paper filter, which can translate into improved throttle response and acceleration, while still capturing the dirt and debris needed to protect the engine over the long term.

Unlike a disposable paper filter that gets thrown away every 12,000-15,000 miles, the 33-2640 is designed to be cleaned and reoiled rather than replaced, typically going up to 75,000 miles between services under normal highway driving. This drop-in design uses the factory air box and mounting points, so installation is straightforward - no cutting, drilling, or piping changes are required.

This filter is intended for 944 S models specifically; owners of the base 944, 944 Turbo, or 944 S2 will need a different K&N part number to match their engine's air box dimensions. It's a good fit for 944 S owners looking for a simple, reusable performance upgrade backed by K&N's lifetime warranty.