The AEM 21-685C 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 SI and Acura ILX 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 driver-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 gunmetal gray powder coated finish. This air intake system was developed to accommodate the engine's factory emissions control devices including the mass air flow sensor, a couple replacement silicone breather hoses as well as a replacement radiator 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 21-685C vehicle applications to determine the legal status for each vehicle.
Specifications:
| Description_DEF |
Engine Cold Air Intake Performance Kit |
| Description_DES |
Cold Air Intake System |
| Description_INV |
Cold Air Intake System |
| Description_EXT |
AEM's Performance Cold Air Intake Systems are designed, tuned and dyno-tested to give your engine more power and acceleration by replacing the restrictive factory air filter, air intake tubing and air box assembly. |
| Description_MKT |
The AEM 21-685C 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 SI and Acura ILX 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 driver-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 gunmetal gray powder coated finish. This air intake system was developed to accommodate the engine's factory emissions control devices including the mass air flow sensor, a couple replacement silicone breather hoses as well as a replacement radiator 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 21-685C vehicle applications to determine the legal status for each vehicle. |
| Description_SHO |
Cold Air Intake Syst |
| Package Type |
Box |
| Replacement Filter |
21-203DK |
| Street Legal In All US States |
Yes |
| Air Filter Color |
Red |
| Air Filter Outlet Shape |
Round |
| Mounting Hardware Included |
Yes |
| TUV Approved (Europe) |
No |
| CARB EO Number |
D-670-21 |
| Clamp Material |
Stainless Steel |
| Prop 65 (C, R or CR) |
CR |
| RPM |
5100 |
| Weight |
8.2 lb (3.7 kg) |
| Air Filter Washable |
Yes |
| Clamp Color/Finish |
Natural |
| Clamps Included |
11 |
| Horse Power Increase |
6 HP |
| Intake Pipe Material |
Aluminum |
| Package Material |
Paperboard |
| Product Style |
AEM Cold Air Intake System |
| Prop 65 - Short Label |
WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov |
| Prop 65 Yes/No |
Yes |
| Warranty |
Limited Lifetime |
| Air Box Included |
No |
| Air Filter Material |
Non-woven Synthetic |
| Clamp Style |
Mini |
| Coupler Color/Finish |
Not Applicable |
| Couplers Included |
None |
| Estimated Horsepower Gain |
6.27 HP @ 5100 RPM |
| Intake Pipe Color / Finish |
Gunmetal Gray |
| Intake Pipe Ports |
All intake tube ports needed for the specified applications are included |
| Mass Air Flow Sensor Adapter Included |
Yes |
| Oil Included |
No |
| Prop 65 Warning Label |
https://www.knfilters.com/images/l/prop65.jpg |
| Title |
AEM AEM-21-685C Cold Air Intake System |
| Length |
12.0000 |
| Width |
12.0000 |
| Height |
20.0000 |
| Weight |
8.0000 |
