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Replacement Filters > Replacement Air Filter

 List Price: $62.00
Your Price: $41.99

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E-9257
 
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K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for virtually every vehicle on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty™ and will be THE LAST AIR FILTER YOUR VEHICLE WILL EVER NEED.

[More Information on Replacement Air Filters]
  • Designed to boost horsepower and rate of acceleration
  • Can be cleaned and used again
  • High air flow with exceptional filtration
  • Lasts up to 50,000 miles before cleaning is required depending on driving conditions
  • Works with original equipment manufacturer vehicle electronics
  • Emissions legal in all 50 US states
  • Will NOT void vehicle warranty
  • Million Mile Limited Warranty®


Product Specifications 
Air Filter Shape:Round
Filter Material:Cotton Gauze
Filter Re-Oiling Amount:0.63 oz (19 ml)
Flanges:None
Height:5.5 in (140 mm)
Inner Wire:No
Inside Diameter:2 in (51 mm)
Outside Diameter:3.5 in (89 mm)
Package Contents:1 Air Filter
Package Quantity:1
Part Number:E-9257
Product Box Height:7.25 in (184 mm)
Product Box Length:4.63 in (117 mm)
Product Box Width:4.63 in (117 mm)
Product Style:Round Air Filter
Top Material/Finish:None
Top Style:Open
Weight:0.59 lb (0.27 kg)


Customer Feedback      Be the first to review part E-9257

After installing a K&N air filter in my 2008 Smart Fortwo I noticed less hesitation during close navigation such as in parking lots and crowded neighborhoods where low speed movement is crucial.

I also noticed a slight improvement in acceleration.
Joshua Pruitt, California
I recently bought a K&N air filter for my 2007 Smart fortwo dsl.

The filter gave the car better power and throttle response, exceeding my expectations even for an engine of 45 horsepower.

Good work done by K&N

Thank you all
Hugo, Porto, Portugal
Bought the replacement filter for my wife's 2013 Smart car. As usual the filter is great. Gave her 3-5 more HP and with her heavy foot it's a plus. The quality of the K&N filter can't be matched. We've had the K&N filters on everything from all 3 of our Corvettes, Acuras and Hondas to my Camaro to now her smart cars. This is her 2nd Smart car. Everyone needs K&N filters on every vehicle in their garage and beyond. Be it a resto-mod or brand new out of the showroom your only choice should be K&N Filters. We even use 'em for oil filters. For a few cents more why screw around with inferior products. Ever see a stock Smart car run the 1/4 mile drag strip taking on another Smart car? My wife would not do it unless she had the K&N filter in her car. Gives her that extra edge every time. Watch those baby cars fly..... If you have any doubts? Don't!! Make the smart choice. K&N Filters !!
Bob Cruz, Texas