K&N E-3952 Rectangular Washable Cotton Air Filter 6.75x4.5x2.5 Weber 38/38

Vehicle Fitment

• Universal Fit - Rectangular air filter applications requiring a 6.75 in. L x 4.50 in. W x 2.50 in. H rectangular filter element
• Specifically designed as a replacement filter element for Weber 38/38 Series carburetor air cleaner assemblies

Fitment Notes

• This is a universal filter element - verify your air cleaner assembly dimensions and carburetor type before purchasing
• Inside dimensions are 5.75 in. L x 3.50 in. W - confirm your assembly's inner housing matches before ordering
• Not a direct OEM replacement for a specific vehicle - confirm fitment by measuring your existing filter or carburetor assembly

Features

• Multi-layer oiled cotton gauze media delivers up to 50% more airflow than standard paper filters
• Rectangular shape designed specifically for Weber 38/38 Series carburetor air cleaner housings
• Washable and reusable - engineered to last the lifetime of your build
• Pre-oiled and ready to install straight out of the box
• Designed to increase horsepower and throttle response on carbureted setups
• Requires cleaning only every 50,000 miles under normal driving conditions
• No inner wire construction for unrestricted airflow
• Backed by K&N's 10-Year/Million Mile Limited Warranty

Specifications

• Shape: Rectangular
• Outside Length: 6.75 in. (171 mm)
• Outside Width: 4.50 in. (114 mm)
• Inside Length: 5.75 in. (146 mm)
• Inside Width: 3.50 in. (89 mm)
• Height: 2.50 in. (64 mm)
• Filter Material: Multi-layer oiled cotton gauze
• Filter Color: Red
• Top Style: Open
• Inner Wire: No
• Weight: 0.99 lb (0.45 kg)

Included Components

• 1x K&N E-3952 Rectangular Air Filter Element

Product Description

The K&N E-3952 is a high-flow rectangular replacement air filter element engineered specifically for Weber 38/38 Series carburetor air cleaner assemblies. Its unique rectangular profile matches the housing geometry of these carburetors, delivering a precise fit without cutting or modification. The multi-layer oiled cotton gauze construction flows significantly more air than a stock paper element, translating to improved throttle response and horsepower gains on carbureted performance builds.

Washable and reusable, the E-3952 arrives pre-oiled and ready to drop in, requiring service only every 50,000 miles under normal use. It is covered by K&N's 10-Year/Million Mile Limited Warranty and is a proven long-term alternative to disposable paper replacements. Whether you're building a classic off-road rig, a vintage street machine, or any carbureted performance application using a Weber 38/38 Series setup, the E-3952 delivers K&N's signature filtration performance in the correct rectangular form factor.