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Part:   21-485B

AEM 21-485B Cold Air Intake

AEM Cold Air Intake System
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.5
  • 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

The AEM 21-485B fits some Mazda RX-8 models. See vehicle applications for details.
The AEM 21-485B 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 Mazda RX-8 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 located above the passenger side wheel well which is designed to reduce intake air temperature and increase horsepower. The intake tubing is comprised of series of gradually expanding inlet pipes including mandrel-bent aluminum featuring a durable blue powder coated finish. This air intake system was developed to accommodate the engine’s factory emissions control devices including the mass air flow sensor and breather hoses. The cone 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 21-485B vehicle applications to determine the legal status for each vehicle.

[More Information on AEM Cold Air Intake Systems]
Specifications AEM 21-485B Product Specifications
Estimated Horsepower Gain8.4 HP @ 7300 RPM
Replacement Filter21-2109DK
Air Filter ColorRed
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
Clamps Included9
Clamp MaterialSteel
Clamp StyleRegular
Couplers IncludedNone
Product StyleAEM Cold Air Intake System
Air Filter Height8.875 in (225 mm)
Intake Pipe Color / FinishBlue
Intake Pipe MaterialAluminum
CARB EO NumberD-670-21
Street Legal In All US StatesYes
TUV Approved (Europe)No
Weight8.6 lb (3.9 kg)
Air Filter Large End Diameter6 in (152 mm)
Product Box Height14.94 in (379 mm)
Product Box Length22.2 in (564 mm)
Product Box Width14.5 in (368 mm)
Mounting Hardware IncludedYes
WarrantyLimited Lifetime

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

Justin Stephenson from Lewisville, Texas
October 3, 2016 - Part 21-485B
I bought this intake for my 2007 Mazda RX-8, and I expected it to be a fairly easy job. It wasnt too hard, as I am a technician, but be prepared to take the wheels, splash shields, bumper, and bumper support. Also, the clips might be crusty, so inspect and buy new ones beforehand. Aside from that, the intake fit perfectly. I would like to say I feel a slight power gain, but it's not much. From the videos, you can hear it pretty well, but I'm straight piped, so you can't hear the intake over the exhaust. Overall, I would recommend this intake to any RX-8 driver who wants a little more out of their car. It looks great and works well. 5 stars from me.
Gerald Perea from Colorado Springs, Colorado
June 6, 2015 - Part 21-485B
I gave this intake a 4 out of 5 because I love the performance of the intake, nothing better on the market for an rx8, I can definitely feel the power increase and even made my accelerations feel like the motor is running smoother compared to other aftermarket intakes I've tried. This intake DOES come with their dry filter sock, I bought one as an add on to find that the intake included one, so now I have 2. My only complaint is the amount of individual pieces there are A LOT of hose clamps used on this intake which gives a lot more opertunities for an air leak, I think it could have been engineered to have less pieces and there for less chances for air leaks. I STRONGLY recommend buying this intake