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30% Off Online Orders of Select Hard Parts. Enter Promo Code MMJ30 in Cart.

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Receive Up To 30% Off Your Online Purchase Of Select Parts And Accessories
Use promotional code MMJ30 at checkout to receive 30% off the following categories: Select Brake Parts, Select Hi-Performance and Truck Accessories, Batteries, Paint, Splash Guards, Select Ventvisors & Bug Shields, Springs & Spacers, Water Pumps, Belts, A/C Parts, Starters, Alternators, Fuel Pumps, Radiators, Radiator Fans, Thermostats, Caps & Clamps, Clutches, Spark Plugs, Plug Wires, CV Axles, Battery Chargers & Booster Cables, OE Locks, Rack & Pinons, Window Motors, RainX Wipers, Appearance Chemicals, Floor Mats, Lift Equipment, Hand Tools, Travel Accessories, Car Covers, Seat Covers, Wheel Covers, Body Repair, Collectibles and Apparel.

Use promotional code MMJ20 at checkout to receive 20% off the following categories: Ignition, Shocks & Struts, Chassis, Jumpstarts, Air Filters, Oil Filters, Bearings & Seals, Engine Parts, Wash Accessories, Outdoor Lifestyle, Towing, Mini Air Compressors, Tire Repair Accessories, Mufflers, Grease/Oil, Additive Chemicals, P/S Pumps, Cooling Product, Timing Belts, Specialty Tools, Radiator Hose, Motor Mounts, Mirrors, Lug Nuts, Sealants/Adhesives, Fuel Filters, P/S Hoses, Gas Cans, Oil Change Accessories, Help, Wiper Motors, Loaner Tools, Air Compressors, Horns, Books, Distributors, Sun Control and Exhaust Adapters.

Use promotional code MMJ15 at checkout to receive 15% off the following categories: Test Equipment, Power Tools, Emergency Supplies, Electronics and Stereo & Accessories (MAP pricing Exclusions).

Offers not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included in these offers will be displayed in product search results and product detail pages. Excludes the following brands: WeatherTech, Champion, Powerstop, Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, Thule, Thule Karrite, JVC, Flowmaster, Hurst, B&M, MSD, Moog, Wagner, Philips and BBK Performance. Valid online until 11:59 PM EST on 11/22/17.

Receive 10% Off Wagner branded brake parts with your online purchase. Use promotional code: WAGNER10.

Receive 20% Off Select Champion branded products with your online purchase. Use promotional code: CHAMP20.

Receive 10% Off Select FelPro branded products with your online purchase. Use promotional code: FELPRO10.

Free Shipping on Orders Over $50 or in-store pickup



Air filters are a critical part of delivering maximum performance to your engine and ensuring protection by keeping harmful contaminants out of your intake manifold and valve train. A clean air filter can improve your car’s acceleration up to 11 percent.

How Difficult is Installation of Air Filters


What is an Air Filter

Air filters are vehicle components that are designed to prevent abrasive particles from entering car engine cylinders. They help to minimize wear and tear on your vehicle’s engine. They range in size and shape and are designed to fit your vehicle application. Air filters are most commonly a panel shape. The primary component of an air filter is the material or media that is surrounded by gasket material. Some filters are supported with wire mesh across the face of the material.

How do Air Filters Work?

Air filters are designed to sit in a cavity near your intake manifold. Your vehicle’s intake manifold pulls air into the engine from the air box and the air filter sits at the top of that box. As air is drawn in, it is pulled across the pleats of media that make up the air filter. That media protects the vehicle and its components by capturing harmful particles before they enter the engine. When clogged, the filter will prevent or restrict proper air flow into the combustion chambers.

How are Air Filters Made?

While construction of air filters may vary slightly, generally they are constructed with gaskets surrounding the filtering media and provide a seal within the air intake chamber. Filtering material is specially designed to remove dirt from the air entering the engine. An external screen on round, radial, and some panel air filters provides strength while allowing the free flow of air to the engine.

Why do Air Filters Fail?

  • Clogs
  • Lack of proper maintenance/replacement
  • Severe driving

What are Symptoms of Air Filter Failure?

  • Poor acceleration
  • Reduced fuel economy of some applications
  • Rough idle and/or starting
  • Check engine light engaging

What are Implications of Air Filter Failure?

  • Internal component damage
  • Clogged filters can become so restricted that the filter collapses and media is drawn into the engine causing catastrophic failure

If you have questions or concerns about air filters, your vehicle’s mass air flow system, or any of your vehicle’s components, come into your local pep boys where we can answer any question, help you find any part, or perform any vehicle service you might need.

If you want to learn more about other car parts, especially as they apply to air filters, we recommend reading up on transmission filters, oil filters, and cabin air filters.