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AIRAID 861-399

Universal Air Filters > Replacement Dry Air Filter
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5.0 out of 5 stars 2 Customer Reviews
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List Price: $102.39
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$81.91 USD

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The AIRAID 861-399 fits some Ford Mustang Shelby GT500 models. See vehicle applications for details.
This AIRAID Direct-Fit Replacement Filter is a drop-in replacement for your vehicle’s stock paper air filter that is designed to improve horsepower and acceleration. The air filter is constructed with multiple layers of filter media and provides significant improvements in air flow and filtration compared to typical replacement filters with the added benefit of being washable and reusable. Why throw money away on a paper filter each time the old one gets dirty when you can upgrade to a serviceable AIRAID Direct-Fit Replacement Filter for often less than the cost of two stock replacements? Installation takes only minutes and is as simple as replacing your stock filter.

[More Information on AIRAID Direct-Fit Replacement Filters]
  • Easy to clean oil-free red synthetic air filter
  • Stock replacement filter for better performance
  • Great filtration with low restriction
  • Washable and reusable
  • Simply takes only a few minutes to install

Available Information

Part 861-399 Product Specifications

Air Filter ShapeRound Tapered
Air Filter ColorRed
Flange Inside Diameter5.625 in (143 mm)
Base Outside Diameter7.5 in (191 mm)
Top Outside Diameter5 in (127 mm)
Height9 in (229 mm)
Package Contents1 Air Filter
Package Quantity1
WarrantyNo-Hassle Lifetime Limited
Product StyleAIRAID Universal Cone Filter
Filter MaterialNon-woven Synthetic
Outside Diameter7.5 in (191 mm)
Outside Length9 in (229 mm)
Outside Width7.5 in (191 mm)
Weight2 lb (0.9 kg)
Product Box Height10.3 in (262 mm)
Product Box Length8.7 in (221 mm)
Product Box Width8.7 in (221 mm)
WARNING: Cancer and reproductive

Product Reviews

August 6, 2018 - Part 861-399
I purchased this filter for my 2015 Ford Mustang GT with Ford Performance Power Pack 2 cold air intake. It is the same as the GT 350 intake. I think AirAid should reference this size filter as a fit for the 2015-2017 GT 350, but they don’t It was difficult to determine which filter to purchase. It’s an excellent replacement and comes in several colors.

Mark Blaisdell
East Kingston, New Hampshire
November 13, 2015 - Part 861-399
As usual the Airaid products were of high quality and the fitment was great. I have used their cold air intakes on 4 mustangs now and would never hesitate to promote the product!

Tim Marshall
Deerfield Beach, Florida
   Review part 861-399