★★★★★ 5
Fits like a glove
Filter my air
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 25, 2026
AEM C.A.S. 17-18 Subaru Legacy H4-2.5L F/I
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
AEM C.A.S. 17-18 Subaru Legacy H4-2.5L F/IAEM AEM 21 856C Cold Air Intake System: 21 856C. 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. Air Box Included: No Air Filter Color: Red Air Filter Material: Non woven Synthetic Air Filter Outlet Shape: Round Air Filter Washable: Yes California Restricted: Not legal for sale or use in
Quick Dispatch:
Your AEM C.A.S. 17-18 Subaru Legacy H4-2.5L F/I orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
Order Tracking:
You'll receive a tracking link by email once your AEM C.A.S. 17-18 Subaru Legacy H4-2.5L F/I ships.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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4.4 ★★★★★
Based on 489 reviews
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Product Reviews
★★★★★ 5
Noticeable scent difference compared to factory standard
Smells clean for months. We are mainly gravel roads and these cabin filters do a great job
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
★★★★★ 5
It fits perfectly.
Great replacement and a very good price.
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Reviewed in the United States on January 17, 2026
★★★★★ 5
Nice and a good price.
Fit our F250 Diesel well.
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Reviewed in the United States on November 10, 2025
★★★★★ 5
Great fitment
Nice fitment
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Reviewed in the United States on December 15, 2025
