★★★★★ 5
Good filter!
I have used this replacement filter for the past 5 changes. Works great
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Reviewed in the United States on April 26, 2026
Injen 18-21 Subaru WRX STI H4-2.5L Turbo SP Aluminum Series Cold Air Intake - Wrinkle Red
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 - 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.
Quick Dispatch:
Your Injen 18-21 Subaru WRX STI H4-2.5L Turbo SP Aluminum Series Cold Air Intake - Wrinkle Red 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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4.2 ★★★★★
Based on 2172 reviews
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Product Reviews
★★★★★ 5
Saved money
Saved money d.i.y.
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Reviewed in the United States on April 20, 2026
★★★★★ 5
Fits my 2015 Subaru Forester perfectly
Works as designed.
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Reviewed in the United States on April 2, 2026
★★★★★ 5
Works in 2019 Subaru Outback!
If you are looking for an engine air filter to fit in your 2019 Subaru Outback then look no further -this one will fit. I tried two others that would not allow me to close the compartment door with the latches. This one slipped in like a hand in a glove.
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Reviewed in the United States on April 25, 2026
★★★★★ 5
Fits 2010 Subaru Forester with 2.5 non-turbo
Definitely looks and feels like a better than OEM air filter. Not sure of any other benefits.
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Reviewed in the United States on May 25, 2026
