AEM pioneered the Cold Air induction system for sport compact cars in 1994.
A Cold Air intake system relocates the filter outside of the engine compartment to deliver the coolest air inlet temperatures possible. Cooler air carries more oxygen, which translates into a more intense explosion in the combustion chamber to create more horesepower and torque. But that's only part of the power equation. Tuning the inlet pipe in length and diameter to match the engine's resonance helps move more air to the cylinders (think of your engine as a big air pump), and no company on the market can tune an inlet as well as we can. We also monitor fuel trim correction factors and all OBDII sensors during R&D to eliminate leaning the engine out and/or throwing a check engine light.
Our Cold Air systems are dyno-proven and tested against the competition to create more useable power than any other system of their kind. Every AEM Cold Air induction system features the highest standards of construction and we are so confident in their fit and performance that we guarantee them for the life of your vehicle. All AEM Cold Air systems are either 50-state legal or pending (excluding "Off Road" and "Hybrid" systems), include a lifetime DRYFLOW Synthetic air filter and come with a limited lifetime warranty.
* Outperforms every other Cold Air system on the market
* Manufactured and assembled in the USA
* 50-state legal or pending legality
* Inlet constructed of lightweight aircraft aluminum and mandrel bent for maximum flow
* Reinforced TIG-welded brackets and fittings deliver added durability
* Utilizes a complete hardware kit with soft mounts for a guaranteed perfect fit
* AEM's lifetime DRYFLOW Synthetic air filter is 99.4% efficient, filters to one micron, and never needs filter oil!
* Comprehensive installation instructions, decals and license plate frame included
* Available powdercoated in red, blue or silver, or with a mirror-polished finish
* Guaranteed for life
Horse Power Increase 3 HP
Intake Pipe Color / Finish Gunmetal Gray
Product Style AEM Cold Air Intake System
Replacement Filter 21-203DK
RPM 6000
Weight 8.3 lb (3.8 kg)
Intake Pipe Material Aluminum
CARB EO Number D-670-22
Title AEM AEM-21-729C AEM Cold Air Intake System
System Type Cold Air Induction
Mounting Hardware Included Yes
Product Box Height 11.6 in (295 mm)
Product Box Length 24.38 in (619 mm)
Product Box Width 12.2 in (310 mm)
Street Legal In All US States Yes
TUV Approved (Europe) No
Air Box Included No
Air Filter Outlet Length 3 in (76 mm)
Air Filter Outlet Width 3 in (76 mm)
Air Filter Washable Yes
Clamp Color/Finish Natural
Coupler Color/Finish Not Applicable
Intake Pipe Inlet Length 3 in (76 mm)
Intake Pipe Inlet Shape Round
Intake Pipe Inlet Width 3 in (76 mm)
Intake Pipe Outlet Length 3 in (76 mm)
Intake Pipe Outlet Shape Round
Intake Pipe Outlet Width 3 in (76 mm)
Mass Air Flow Sensor Adapter Included Mass Air Flow Sensor Adapter Included When Required
Oil Included No Filter Oil Required
Package Material Paperboard
Package Type Box
Warranty Limited Lifetime
Air Filter Height 5.00 in. (127mm)
Couplers Included None
Estimated Horse Power Gain 3 HP @ 6000 RPM
Filter Color Red
Filter Material Non-woven Synthetic
Item Weight 8.3000 lbs.
Product Box Height 11.60 in. (295mm)
Product Box Length 24.38 in. (619mm)
Product Box Width 12.20 in. (310mm)
Street Legal Yes
Air Filter Element Washable Yes
Air Filter Oulet Length 3.00 in. (76 mm)
Air Filter Oulet Width 3.00 in. (76 mm)
Clamp Color Natural
Coupler Color Not Applicable
Intake Pipe Inlet Length 3.00 in. (76 mm)
Intake Pipe Inlet Width 3.00 in. (76 mm)
Intake Pipe Outlet Length 3.00 in. (76 mm)
Intake Pipe Outlet Width 3.00 in. (76 mm)
Mass Air Flow Sensor Included Mass Air Flow Sensor Adapter Included When Required
Clamp Quantity 3
Intake Pipe Color Gunmetal Gray