The Classic Performance Air Filter 4In Inlet ID

The Classic Performance Air Filter 4In Inlet ID from Vibrant Performance is a universal clamp-on conical air filter element engineered for enthusiasts seeking improved engine breathing without sacrificing classic aesthetics. Whether you're building a street machine, restoring a vintage hot rod, or tuning a modern performance engine, this cotton element addresses a critical bottleneck in any induction system: restrictive OEM filtration. The 4-inch inlet diameter accommodates a wide range of carbureted and fuel-injected applications where space and style matter equally.

This filter leverages premium cotton media construction, which balances airflow efficiency with robust particulate capture—a proven design choice for serious engine builders who demand both horsepower and longevity. The conical geometry maximizes surface area, reducing intake restriction while the red finish delivers the vintage drag-strip look that complements classic fuel injection kits and carb setups alike. Standing 4.25 inches tall with a 6.5-inch base tapering to a 5-inch top diameter, the element integrates seamlessly via a universal 4-inch flange clamp mount, making installation straightforward on custom intake manifolds, throttle bodies, and fabricated induction systems. The compact 0.95 lb weight ensures negligible thermal mass impact on engine response.

Mechanics and fabricators favor the Classic Performance Air Filter 4In Inlet ID for restomod projects, engine swaps, and custom carb builds where OEM air boxes won't fit or suit the finished look. Its universal mounting flange accommodates both bolt-on velocity stacks and custom welded intake piping, making it ideal for single-carb setups, tunnel ram applications, and late-model swapped-engine installations. Cotton media also tolerates dry or lightly oiled filter wraps, offering flexibility in maintenance strategies. For anyone rejecting plastic intake boxes in pursuit of authentic performance or modern horsepower gains, this Vibrant Performance element delivers reliable filtration without visual compromise.