★★★★★ 5
Great value for the price
Perfect fit,good quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 11, 2025
Injen 18-21 Subaru WRX STI H4 2.5L Turbo SP Aluminum Series Cold Air Intake - Polished
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Injen 18-21 Subaru WRX STI H4 2.5L Turbo SP Aluminum Series Cold Air Intake - PolishedSKU: SP1208P UPC: 843115029739 Injen 18 21 Subaru WRX STI H4 2. 5L Turbo SP Aluminum Series Cold Air Intake Polished Transform airflow in your 2018 2021 Subaru WRX STI with the Injen SP1208P SP Aluminum Series Cold Air Intake in polished finish. Engineered for the H4 2. 5L Turbo, it replaces stock airbox for dyno proven gains of 12 HP and 13 lb ft torque. Hear the aggressive throaty tone while enjoying reliable filtration and power delivery. Key
Quick Dispatch:
Your Injen 18-21 Subaru WRX STI H4 2.5L Turbo SP Aluminum Series Cold Air Intake - Polished orders ship within 1-2 business days.
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- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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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]
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4.1 ★★★★★
Based on 758 reviews
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Product Reviews
★★★★★ 5
Power steering leak
Worked great. No problem at all.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 16, 2026
★★★★★ 5
perfect fit for 2005 acura rsx s-type
Why did you pick this product vs others?:
fixed my PS pump leak fast.
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Reviewed in the United States on July 7, 2025
★★★★★ 5
So good. No more whine!
Worked like a charm on a 2007 & 2009 Accord 4cyl
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Reviewed in the United States on December 18, 2025
★★★★★ 4
No instructions
No instructions... No idea which one is the high pressure side.They seem to be good quality but I have not used them yet...
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Reviewed in the United States on December 3, 2025
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