K&N Replacement Air Filter Monster S2R / S4R

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This K&N racing air filter has just two layers of cotton to provide even lower air restriction than our replacement air filter for street vehicles. Unlike K&N replacement air filte rs, fuel management modifications will be necessary with this racing filter. K&N racing air filters are washable and reusable. Features: Designed to increase horsepower and acceleration. Designed for racing and track applications, not for street use. Washable and reusable air filter. Low restriction. Specifications: Filte Material: Cotton Gauze Washable: Yes Height: 24mm Outside Length: 279mm Outside Width: 217mm Filter Re-Oiling Amount: 33ml Show more