K&N Replacement Air Filter Monster S2R / S4R

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 filters, 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