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K&N 63-1123

Cold Air Intake System

K&N 63-1123


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K&N 63-1123 Cold Air Intake System $344.99
Cold Air Intake System
  • 2004-2009 Yamaha YFZ450 449
  • 2007-2009 Yamaha YFZ450 SE 449
  • +4.2 HP Increase

  • K&N 63-1123 Details


    • Guaranteed to increase horsepower
    • Designed to improve throttle response and engine sound
    • Free-flowing high density polyethylene tube
    • Easy to install, usually in 90 minutes or less
    • Replaces entire factory air intake system
    • Washable and reusable air filter
    • Not legal for sale or use in California or other states adopting California emission standards.


    Replacement Filter
    Horse Power Increase
    4 HP
    Clamp Material
    Stainless Steel
    Clamps Included
    Couplers Included
    Filter Material
    Cotton Gauze
    Filter Color
    Clamp Style
    Intake Pipe Material
    High-Density Polyethylene
    Air Filter Outlet Shape
    Intake Pipe Color / Finish
    Air Filter Large End Diameter
    6 in (152 mm)
    Product Style
    Motorcycle Intake System
    California Restricted
    Not legal for sale or use in California
    Weight (lbs.)
    6.2 lb (2.8 kg)
    Air Filter Height
    5.5 in (140 mm)
    Estimated HorsePower Gain
    4.2 HP @ 7200 RPM
    Manufacturer's Part Number:

    K&N's 57 (FIPK) and 63 (AirCharger) Series Air Intake Systems are an improvement over simply using a K&N OE Replacement Filter alone. These high-flow cold air intake systems contain non-metallic, rotationally-molded tubes to reduce intake air temperature and sound. Restriction between the air filter and engine can rob a vehicle of horsepower, and K&N Air Intake Kits are designed to prevent air path restriction with an aerodynamic tube that allows a large amount of air into the engine; resulting in more power.

    K&N High-Flow Cold Air Intakes use factory holes/mounts to position the largest possible conical air filter into the engine compartment. The oversized filter produces more airflow at lower restriction and also captures and holds more dirt to extend the filter's service life (up to 100,000 miles) before cleaning is needed. A heat shield isolates the filter from high engine heat and reduces the temperature of the air as it enters the engine to increase horsepower. The air filter is attached to a precision-formed, high-density polyethylene tube that reduces turbulence and accelerates airflow into the engine. High-strength, silicon & reinforced nylon adapters connect the tube to the engine to ensure long-term performance.


    • Vehicle-Specific Design
    • Washable/Reusable Air Filter
    • Replaces OE Filter and Air Box
    • Works with Original Factory Computer
    • Easy to Install (Usually 90 minutes or less)
    • Guaranteed to Provide More HP and Better Acceleration
    • Built to Use Stock Holes & Mounting Points Whenever Possible
    • Street-Legal in Most States except California (Check part number or vehicle listing for CARB status)
    • Lasts up to 100,000 Miles before Requiring Service
    • Million Mile Limited Warranty