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Part:   21-785DS

AEM 21-785DS Cold Air Intake

AEM Cold Air Intake System
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   3.0
  • Designed to increase horsepower
  • Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
  • Washable and reusable oil-free filter media
  • AEM logo on the airbox cover
  • Backed by AEM Limited Lifetime Warranty

The AEM 21-785DS fits some BMW 228i, BMW 320i, BMW 328i, and BMW 428i models. See vehicle applications for details.
The AEM-21-785DS is designed to replace the restrictive air filter and airbox of some BMW 320i and 328i models with 2.0L turbo 4 cylinder engines. This enclosed system is designed with an upper and lower airbox to maximize air supply to the air filter, and acts as a heatshield. The 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). A MAF sensor extension and other hardware is provided for the installation. An AEM logo provides the finishing touche on the airbox cover. Designed to increase horsepower this air intake system also gives the BMW's engine a facelift. 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 21-785DS vehicle applications to determine the legal status for each vehicle.

[More Information on AEM Intake Systems for BMW]
Specifications AEM 21-785DS Product Specifications
Estimated Horsepower Gain14 HP @ 4700 RPM
Replacement Filter21-1015DK
Air Filter ColorRed
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
Clamps IncludedNo Clamps Required
Clamp MaterialNo Clamps Required
Clamp StyleNo Clamps Required
Couplers IncludedNone
Product StyleAEM Cold Air Intake System
Intake Pipe Color / FinishBlack
Intake Pipe MaterialHigh-Density Polyethylene
Street Legal In All US States No
TUV Approved (Europe)No
Weight14.5 lb (6.6 kg)
Product Box Height10.6 in (269 mm)
Product Box Length35.4 in (899 mm)
Product Box Width13.3 in (338 mm)
California RestrictedNot legal for sale or use in California
Mounting Hardware IncludedYes
WarrantyLimited Lifetime

Horsepower gains based on similar vehicle dynamometer test. Results will vary.
WARNING: Cancer and reproductive
Reviews Product Reviews

Rob Moser from Uniontown, Ohio
July 26, 2018 - Part 21-785DS
I like the product, but I did find it more difficult to install than anticipated. I blame BMW partially, it is very tight under the hood. But the new intake did not want to connect to the existing, took a while to clamp properly (again the space was so tight the screw was hard to reach. Also the 3 bolts attaching the cover were located underneath and was nearly impossible to squeeze a finger or a tool in there to tighten those bolts. In fact I ended up losing one of the bolts because I dropped it and it disappeared inside the engine never to be found again. So right now it's connected with two of the three bolts which seems to be okay but I could use the third Bolt to finish the job. But it does look good and it does sound good and possibly it's added a few horsepower.