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Injen 18-21 Subaru WRX STI H4-2.5L Turbo SP Aluminum Series Cold Air Intake - Wrinkle Red

Marsoni M251S
Sale price$184.55
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Injen 18-21 Subaru WRX STI H4-2.5L Turbo SP Aluminum Series Cold Air Intake - Wrinkle RedSKU: SP1208WR UPC: 843115029746 Injen 18 21 Subaru WRX STI H4 2. 5L Turbo SP Aluminum Series Cold Air Intake Wrinkle Red This Injen SP Series cold air intake system upgrades 2018 2021 Subaru WRX STI models with a mandrel bent 6061 T6 aluminum tube in wrinkle red finish for maximum airflow and dyno proven gains up to 14 HP and 15 lb ft torque. It fits Base, Limited, S209, and Type RA submodels with bolt on installation that replaces stock airbox.
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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.
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4.9 ★★★★★
Based on 1109 reviews
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Product Reviews
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Verified Purchase
Doplar
West Palm Beach, US
★★★★★ 5
Satisfied
Size: (Pack of 1)
Good product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 4, 2026
S
Verified Purchase
Shane walton
Carnegie, US
★★★★★ 5
Perfect fit
Size: (Pack of 1)
Perfect fit
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
B
Verified Purchase
Bradford Van Dam
Louisville, US
★★★★★ 5
I highly recommend this air filter
Size: (Pack of 1)
Why did you pick this product vs others?: Great buy for the money Smell: Smells fresh Air quality: The air quality in the car cabin smells fresh Filter quality: FILTER SEEMS TO BE PROFESSIONAL QUALITY Ease of installation: SUPER EASY TO INSTALL 
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 21, 2025
D
Verified Purchase
David B.
Chelsea, US
★★★★★ 4
Affordable and very good
Size: (Pack of 1)
Not sure if there is a longevity issue with these but these are fair priced and fit perfectly in my 21’ accord sport and 20’ CRV-L. I will be buying this again next year
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 28, 2024
J
Verified Purchase
J
Birmingham, US
★★★★★ 5
Clear Filter
Size: (Pack of 1)
Vehicle: 2020 Honda Accord LX 1.5T CVT The stealership wanted $60 in my area to change this out. Just look up online how easy it is to do it yourself. Can easily be handled in a minute. The only real thing to note is that it took almost a full gas tank for the car's computer to re-learn how to idle smoothly again. Of course, this is because it learns to compensate for the old dirty filter. So it has to get used to the new/fresh one. Overall, the look and feel of this product is great. Very similar to OEM. After the idle smoothed out it's virtually identical in performance. Would recommend to anyone.
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Reviewed in the United States on May 1, 2024

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