K&N Performance Cold Air Intake Kit 69-3517TS with Lifetime Filter for Ford Focus 2.0L, Non-Turbo Estimated horsepower gain of 9.97 HP at 5872 RPM Designed to improve throttle response and engine sound Easy to install, usually in 90 minutes or less Replaces stock air intake system Lasts up to 100,000 miles before service is required (depending on driving conditions)