Unitronic Carbon Intake System with Inlet B9 RS4/5 2.9TFSI

Unitronic Carbon Intake System with Inlet B9 RS4/5 2.9TFSI

Marsoni

M251S

$1042.99

Get it in 3 business days with 1 day shipping. Friday, May 29

Unitronic Carbon Intake System with Inlet B9 RS4/5 2.9TFSIThis Carbon Fiber Intake System and Turbo Inlet for the B9 and B9. 5 Audi RS 4 and RS 5 is designed to dramatically improve airflow with gains of up to 38% over the factory equipment while supporting both the stock turbochargers and hybrid turbochargers via Unitronic's clever 48mm and 51mm adapter rings. As with all Unitronic Intake Systems, this unit provides improved throttle response, seamless integration and perfect fitment while greatly enhancing

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We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
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Got this to replace cabin air filter on 2020 Honda Civic Sport, as it said it was a direct fit… It does fit but not perfectly! Holding it next to the filter you can see the size difference, with the original being slightly longer. I noticed a whistling sound from the AC at full blast right after install. I believe this noise is caused by the small gap left in the retainer box with the slightly smaller filter. Luckily it is not incredibly loud, but it’s still there. The quality of filtration seems to be much better than stock filter, but the fitment not exact for vehicles mentioned above.

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Reviewed in the United States on May 17, 2026

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Bon43

Belleville, US

★★★★★ 5

Awesome

Easy to install. Fit appropriately. Value for the money for sure.

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Reviewed in the United States on September 26, 2025

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tprizzle

Cuba, US

★★★★★ 5

Will continue to repurchase

I have purchased this product multiple times for my Honda CRV. Works great and is actually pretty easy to install. I will definitely repurchase once the time comes to replace again. Great value for the price compared to at the dealership

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Reviewed in the United States on June 1, 2025

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Amazon Customer

Houston, US

★★★★★ 5

Good engine filter at a fair price

Worked for my 2018 Honda CR-V. Arrived quickly. Make sure you check the shape of your filter before ordering. I originally ordered a rectangular filter that Amazon said would work for my car. I was able to return it and order the correct one.

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Reviewed in the United States on April 1, 2026

Verified Purchase

Calvin

Battle Creek, US

★★★★★ 4

👍🏾

Perfect fit

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Reviewed in the United States on March 7, 2026