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

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

Marsoni

M251S

$184.55

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

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We offer a 30-day return/exchange service after receiving.
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This filter kit is a convenient all-in-one replacement for my 2011–2017 Honda Odyssey. Both the cabin and engine air filters fit perfectly and were easy to swap out in just a few minutes. The quality feels solid, and it’s great not having to buy the filters separately. A quick upgrade that helps the van run cleaner and keeps the cabin air fresh.

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Reviewed in the United States on December 10, 2025

L&S

Fort Morgan, US

★★★★★ 5

Impressive High-Tech Cabin Filter That Actually Eliminates Odors

This is by far the most advanced cabin filter I’ve ever used. My 2017 Civic came with a lingering interior smell that even a full professional detail couldn’t remove—but this filter did the trick almost immediately. The design is impressive, with a sturdy outer “shell” and clear labeling that makes installation quick and foolproof. It has a very modern, high-tech look, and the airflow direction is easy to identify. The fit is spot-on, and the performance has genuinely exceeded my expectations. I’m so impressed that I plan to switch my other vehicles over to this same style of filter in the future.

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Reviewed in the United States on November 18, 2025

Verified Purchase

Jonny

Birmingham, US

★★★★★ 5

Perfect Fit for Civic

Installed this engine cabin air filter on my daughter’s Civic and it fit perfectly. Installation was quick and easy, and the quality feels just like OEM. Great value compared to dealership prices.

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Reviewed in the United States on January 11, 2026

Verified Purchase

Chelsea, US

★★★★★ 5

Perfect Fit

The product arrived today and I installed it right away, no issues. The fit was perfect for my 2022 Civic Sport and the quality matches that of Honda OEM.

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Reviewed in the United States on March 5, 2026

Verified Purchase

BRENDA J.

New York, US

★★★★★ 5

Saved on DIY

Fit my 2021 Civic perfectly and with you tube video easy to install

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Reviewed in the United States on February 22, 2026