aFe® 21-90045 - Magnum Flow™ Pro Dry S Round Tapered Gray Air Filter (5.5" F x 7" B x 5.5" T x 7" H)

53 reviews|Item # mpn644292 View Similar Products
In Stock (15) - Ships within 24 hrs
Custom Built / Racing
Fitment Notes:
  • Not Vehicle Specific. May require professional installation. Typically used with custom built or racing vehicles
  • California Proposition 65 Warning.
Add To Cart
Add to Wishlist
Authorized Dealer

Have a Question? Ask a Specialist

888.634.9437Live Chat
Low Prices. Price match guarantee
Guaranteed Fitment. Always the correct part
In-House Experts. We know our products
Easy Returns. Quick & Hassle Free

Product Details

Magnum Flow™ Pro Dry S Round Tapered Gray Air Filter (21-90045) by aFe®. This high flow Pro DRY S air filters are constructed with 100% polyurethane on all sides and will out flow the stock paper filters for improved performance. Layers of progressively finer synthetic media provides maximum convenience and can be cleaned with soap and water. Washable and reusable for multiple cleaning cycles, the tall, open and evenly spaced filter pleats provide excellent dust holding capacity for longer service cycle between cleanings. An integrated urethane bump seal insures a tight, leak-free seal over the life of the filter. The aFe filter system increased air flow 25% over the factory air filter set increasing horsepower, torque and improving throttle response. CA Prop 65 WARNING - This product contains chemicals known to the State of California to cause cancer, and/or birth defects or other reproductive harm.

Notes: California Proposition 65 Warning.


Filter Types: Intake System Replacement Filter
Series: Magnum Flow™
Filter Shape: Round Tapered
Filter Style: Flanged
Flange Type: Single Flange
Flange Shape: Round Flange
Filter Color: Gray
Filter Top Type: Flat Top
Filter Flange Type: Centered
Filter Flange Inside Diameter: 5.5"
Filter Top Outside Diameter: 5.5"
Filter Base Outside Diameter: 7"
Filter Height: 7"
Air Filter Material: Synthetic


  • Improves airflow for better performance and acceleration
  • Oil-free for easy quick servicing and yet washable/reuseable air filter for long service life with life-time warranty
  • Pro DRY S Three-Layer Progressively finer porosity synthetic media for high airflow with high filtration efficiency
  • Tall, Rounded, evenly-spaced pleats for maximum dust holding capactiy
  • Constructed with 100% pliable polyurethane for great seal without use of foam gaskets or sealing grease

aFe® (Advanced Flow Engineering, Inc.) manufactures performance products for late model cars, light trucks and SUVs. The company was founded in 1999 with an initial concentration on high performance air filters. Since then, the company product line has broadened to include cold air intakes, fluid filters, exhaust systems, intake manifolds, intercoolers, programmers, differential covers, transmission pans and throttle body spacers. The team of engineers, machinists, production and sales people at aFe® have many years of experience in their respective positions, and together work to ensure they produce the best automotive products on the market.

Part Number:


aFe warrants their products to be free from manufacturer's defects due to workmanship and material. This warranty applies only to the original purchaser of the product and is non-transferable. Proof of purchase of the aFe product is required for all warranty claims. Warranty is valid provided aFe instructions for installation and/or cleaning were properly followed. Proper maintenance with regular inspections of product is required to insure warranty coverage. Damage due to improper installation, abuse, unauthorized repair or alteration is not warranted. Incidental or consequential damages or cost, including installation and removal of part, incurred due to failure of aFe product is not covered under this warranty. All warranty is limited to the repair and/or replacement of the aFe part.

aFe OE replacement filters are warranted against manufacturer defects for as long as you own the vehicle and it is properly maintained using aFe filter cleaning kit.

  • aFe universal clamp on air filters and air intake kits are warranted against manufacturer defects for 2 years
  • aFe Diesel Fuel System are warranted against manufacturer defects for 2 years
  • aFe Sprint Booster are warranted against manufacturer defects for 3 years
  • aFe racing filters are warranted against manufacturer defects for 1 year
  • aFe Electronics (Tuners/Modules) are warranted against manufacture defects for 2 years. If the item has been opened, aFe will offer an exchange for the same product only
  • All warranty is contingent on proper installation and proper maintenance using aFe restore kit
  • All other aFe products such as exhaust systems, intake manifolds, turbo chargers, intercoolers and differential covers have a 2-year warranty
  • aFe Power OE replacement performance filters have a limited lifetime warranty
  • Suspension 1-year warranty
Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Vehicle Fitment

This part is custom built / racing
  • Not Vehicle Specific. May require professional installation. Typically used with custom built or racing vehicles



Every Customer can leave a review about our service and the product that was purchased. In order to leave your review for your new product, please follow the link in the email you receive after completing your purchase. You can rate appearance, ease of installation, price/value and product quality.

aFe® - Magnum Flow™ Air Filter
aFe® 21-90045 - Magnum Flow™ Pro Dry S Round Tapered Gray Air Filter (5.5" F x 7" B x 5.5" T x 7" H)
Average Rating: 4.8 of 5
4.8 of 5
This is the only cold air intake that fits my Crown Victoria police interceptor and it works amazingly. Powder coating is done perfectly and it even comes with new mass air flow screws for the sensor. 10/10.
Posted by (Oswego, IL) / 2008 Ford Crown Victoria
Was this review helpful for you? Yes
4.8 of 5
Air Filtration
Great so far. My last filter was almost black due to the ash from the wild fires. After installation I saw a significant increase in my fuel economy.
Posted by (Sumner, WA) /
Was this review helpful for you? Yes
5 of 5
Best Air Filter for 2011 Lexus IS250 AWD
This filter works great with Takeda TR-2004B-R short-ram intake system. I've also tried the Pro 5R air filter (which is standard assembly with TR-2004B-R intake that requires periodic oil application) for couple months but I have concluded that DRY S air filter works much better with the system. My favorite part is the mileage gain to my vehicle. My car, at full tank, was able to drive roughly 320 miles. With Pro 5R, I was at 364 miles consistently. Now with Pro DRY S, it can drive 377 miles. Many will say that oiled air filter perform better than the dry ones, but while it is true, there is no noticeable difference. This is the air filter to go with if you are looking for one!
Posted by (Farmington Hills, MI) /
Was this review helpful for you? Yes
Low Prices Price match guarantee
Guaranteed Fitment Always the correct part
In-House Experts We know our products
Easy Returns Quick & Hassle Free

All manufacturer names, symbols, and descriptions, used in our images and text are used solely for identification purposes only. It is neither inferred nor implied that any item sold by is a product authorized by or in any way connected with any vehicle manufacturers displayed on this page.