AEM Cold Air Intake System

AEM Cold Air Intake System

  • Part#: 21-400P
  • | SKU: 20054657
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  • Increased horsepower
  • Tuned and dyno-tested to improve acceleration and engine sound

AEM Cold Air Intake System

The AEM 21-400P Performance Cold Air Intake System produces horsepower and torque gains by replacing your vehicle's restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno-tested to fit specific Honda Civic and CRX models. Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air filter is relocated to the passenger-side wheel well which is designed to reduce intake air temperature and increase horsepower. The intake tubing is constructed from mandrel-bent aluminum featuring a durable chrome-like finish. This air intake system was developed to accommodate the engine's factory emissions control devices including a replacement engine breather hose and water bypass hose. The tapered cylinder shaped AEM Dryflow air filter is made from an oil-free, synthetic filter media that can be used for up to 100,000 miles before cleaning is needed (depending on driving conditions). The air intake system is backed by AEM's Lifetime Limited Warranty. Some AEM air intakes are not legal for sale or use in California and other states adopting California emission standards, while others are 50 state legal. View the 21-400P vehicle applications to determine the legal status for each vehicle.

  • Increased horsepower
  • Tuned and dyno-tested to improve acceleration and engine sound
  • Low restriction aluminum tubing
  • Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
  • Washable and reusable oil-free filter media
  • AEM Lifetime Limited Warranty


Product Length 35.5
Contains Toluene? No
Is a Remanufactured Part? No
Is a Hazardous Material? No
Product Width 13.25
Product Height 10.6
Air Filter Outlet Shape Round
Clamp Material Steel
Air Filter Color Red
Air Filter Large End Diameter 6 in (152 mm)
Product Box Height 10.6 in (269 mm)
Color Polished
Air Filter Height 5.125 in (130 mm)
Clamps Included 7
Intake Pipe Color / Finish Polished
Air Filter Material Non-woven Synthetic
Clamp Style Regular
Product Box Length 35.5 in (902 mm)

20054657

  • Description & Features

    .

    AEM Cold Air Intake System

    The AEM 21-400P Performance Cold Air Intake System produces horsepower and torque gains by replacing your vehicle's restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno-tested to fit specific Honda Civic and CRX models. Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air filter is relocated to the passenger-side wheel well which is designed to reduce intake air temperature and increase horsepower. The intake tubing is constructed from mandrel-bent aluminum featuring a durable chrome-like finish. This air intake system was developed to accommodate the engine's factory emissions control devices including a replacement engine breather hose and water bypass hose. The tapered cylinder shaped AEM Dryflow air filter is made from an oil-free, synthetic filter media that can be used for up to 100,000 miles before cleaning is needed (depending on driving conditions). The air intake system is backed by AEM's Lifetime Limited Warranty. Some AEM air intakes are not legal for sale or use in California and other states adopting California emission standards, while others are 50 state legal. View the 21-400P vehicle applications to determine the legal status for each vehicle.

    • Increased horsepower
    • Tuned and dyno-tested to improve acceleration and engine sound
    • Low restriction aluminum tubing
    • Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
    • Washable and reusable oil-free filter media
    • AEM Lifetime Limited Warranty


  • Specifications

    .
    Product Length 35.5
    Contains Toluene? No
    Is a Remanufactured Part? No
    Is a Hazardous Material? No
    Product Width 13.25
    Product Height 10.6
    Air Filter Outlet Shape Round
    Clamp Material Steel
    Air Filter Color Red
    Air Filter Large End Diameter 6 in (152 mm)
    Product Box Height 10.6 in (269 mm)
    Color Polished
    Air Filter Height 5.125 in (130 mm)
    Clamps Included 7
    Intake Pipe Color / Finish Polished
    Air Filter Material Non-woven Synthetic
    Clamp Style Regular
    Product Box Length 35.5 in (902 mm)
  • Customer Reviews

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    20054657

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