The K&N 4" universal air filter is our go-to round tapered air filter for our 4" turbo applications. We use this filter on our big single turbo MK4 Toyota Supra builds to provide plenty of airflow. This filter provides superior filtration and high flow characteristics compared to cheaper/inferior products. Don't risk damage to your turbo or engine with a cheap air filter!
From K&N:
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16 of an inch (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.
Product Specifications:
Product Style: Round Tapered Universal Air Filter
Base Outside Diameter: 6 inches (152 mm)
Flange Inside Diameter: 4 inches (102 mm)
Flange Length: 1.75 inches (44 mm)
Flange Type: Centered
Height: 9 inches (229 mm)
Top Outside Diameter: 4.625 inches (117 mm)
Top Style: Rubber
Top Material/Finish: None
Filter Material: Cotton Gauze
Filter Re-Oiling Amount: 1.73 oz (51 ml)
Weight: 2 lb (0.9 kg)
