K&N Cold Air Intake Kit: Guaranteed to Increase Horsepower: Fits 2001-2017 HARLEY DAVIDSON (Street Bob, Fat Bob, Boy, Low Rider, Dyna Wide Glide, Switchback, other select models)57-1125

ULTIMATE LONGEVITY: 10-Year/Million Mile Limited Warranty protects for the life of your vehicle.. GUARANTEED INCREASE IN HORSEPOWER: Dyno-tested with up to 50% more airflow than restrictive factory box air filter and intake tube. BETTER TOWING: Improves acceleration and uphill performance when towing by improving throttle response.. IMPROVED ENGINE SOUND: Hear the power under the hood.. WORLD CLASS PROTECTION: Pushing the limits of engine protection by protecting your engine from harmful contaminants. EASY MAINTENANCE: No filter cleaning required for up to 100,000 miles. EASY TO INSTALL: Bolt-on power in less than an hour with basic hand tools. K&N air intake systems are one of the easiest ways to guarantee an increase in horsepower.. DYNO TESTED: Dyno-tested for a guaranteed increase in horsepower and acceleration with no ECU tune required. HIGH QUALITY: Made in America.. RACETRACK APPROVED: The Official Air Filter of NASCAR. Trusted on the racetrack—made for your vehicle.