57-0421 Image

57i Series Kits > Performance Intake Kit

 List Price: $275.21
Your Price: $151.99

You Save 44.8%

Find a Local K&N Dealer


       

57-0421
 
In Stock & Ready to Ship!
 Free Ground Shipping!


K&N 57i Series Induction Kits are specifically designed for each different vehicle and will free your car from the size restriction that comes with the factory air box. These economical kits can take a variety of different forms based on vehicle characteristics and available space under the hood. Each kit is designed to provide power throughout the RPM range. The extra surface area of these open-air air filters provide even more airflow at lower restriction than a K&N O/E replacement filter which is always limited to the size of the factory air box. The larger air filter also captures and holds more dirt increasing its service life before a cleaning is required (up to 100,000 miles). The filter is either directly attached to the engine carburetor or throttle body or indirectly through a tube assembly running from the filter to the engine. All adapters are made from high quality materials such as steel, aluminum, silicon or reinforced nylon to ensure long life. 57i Intakes are not legal for use in California and other US States adopting California emission standards.

[More Information on 57i Induction Systems]
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Replaces entire factory air intake system
  • Not legal for highway use in states adopting California emission regulations
  • Washable and reusable lifetime air filter
  • Lasts up to 100,000 miles before service is required (depending on driving conditions)
  • Easy to install, usually in 90 minutes or less
  • K&N Million Mile Limited Warranty®
Available Information
Installation Instruction Sheet
57-0421 Vehicle Applications
Instructions Francaises - French


Part 57-0421 Product Specifications
Product Style: 57i Series International Kits
Replacement Filter: RC-3600
Air Filter Color: Red
Air Filter Outlet Shape: Not Flanged
Street Legal In All US States: No
Air Filter Height: 5 in (127 mm)
TUV Approved (Europe): No
Air Filter Material: Cotton Gauze
Clamps Included: 3
Clamp Material: Steel
Clamp Style: Regular
Type: Gen I
Intake Pipe Color / Finish: Black
Intake Pipe Ports: All intake tube ports needed for the specified applications are included
Vacuum Tubing Included: No
Air Filter Large End Diameter: 5.375 in (137 mm)
Base Outside Diameter: 5.375 in (137 mm)
California Restricted: Not legal for sale or use in California
Flange Inside Diameter: 4 in (102 mm)
Flange Length: 0.625 in (16 mm)
Flange Type: Centered
Height: 5 in (127 mm)
Mass Air Flow Sensor Adapter Included: Mass Air Flow Sensor Adapter Included When Required
Top Material/Finish: Chrome
Top Outside Diameter: 4.5 in (114 mm)
Top Style: Metal
Weight: 2.9 lb (1.3 kg)
Product Box Length: 9 in (229 mm)
Product Box Width: 9 in (229 mm)
Product Box Height: 9 in (229 mm)



Customer Feedback      Be the first to review part 57-0421

Dear K&N,

I own a 2002 Volkswagen Bora 1.9 TDi Sport 150 with 85,000 miles on the clock. It's a high miler as I use it pretty much every day for work and I need to travel about rather a lot. The car is pretty quick but had developed a flat spot around the 800 to 1800rpm spot. In an effort to fix it, I purchased one of your replacement air filters (P/N 33-2128). It arrived yesterday and despite the rain, I went out and fitted it straight away, removing the extremely grotty original filter plus general muck and leaves from the air box in the process. And, of course, went out for a test drive to see if it had worked.

So, did it fix the flat spot? Hell, yes! It also enormously improved throttle responsiveness and there was a very noticeable increase in power with much better acceleration. My Bora felt like the sporty diesel it should have been in the first place! I managed to scare myself silly by activating the traction control system in *4th* while accelerating out of a corner. Now, that has *never* happened before!

I definitely recommend fitting one of your filters and only wish I'd done it earlier. Now, how do I claim for soiled underwear ..? :)

Thanks K&N!

P.S. Why aren't your filters fitted as standard equipment?
James McGregor, Islay, UK
Installation time and procedure in my Audi was exactly as stated. No surprises. Noticeably improved throttle response with the K&N cold air intake versus the stock airbox. Definitely recommend this upgrade.
Mike, Ohio
Delivery was fast even with standard shipping. Install was a little tricky but not because of the filter but because of my vehicle (2011 Audi Q5 3.2 V6 Quattro). The screws did not align exact with the housing but nothing a pair of pliers didn't fix by bending them just ever so slightly. Other than that, I love the filter. I am unsure if this added any more horsepower but I didn't notice a little more pep and get up and go after the install. Fuel economy seems the same but I hadn't been recording the mileage. In conclusion, I am very satisfied. P.S. MAKE AN AIR INTAKE FOR MY VEHICLE AND I'LL BUY IT!!
Alex Hernandez Jr, Texas