Unitronic Audi B9 S4/S5 3.0TFSI ECU Upgrade

Unitronic Audi B9 S4/S5 3.0TFSI ECU Upgrade

Marsoni

M251S

$350.00

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

Unitronic Audi B9 S4/S5 3.0TFSI ECU UpgradeFeatures Optimized Responsiveness, Smoothness, Drivability, and Comfort Unitronics ECU calibrations are engineered to improve engine response and reduce low end lag. Unitronics Performance Software has gained worldwide recognition and is well known for its broad powerband, with smooth power delivery, maximizing responsiveness and area under the curve, under normal and hard acceleration. Ignition Timing Precisely Calibrated for Higher Octane Fuel

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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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I ordered this Uselection brand Cabin + Engine air filter set for my 2017 Honda CR-V 1.5L vehicle. These filters are sturdy and well-constructed. The cabin air filter contains activated carbon to absorb odors and isn't thin and flimsy like other brands. Both filters fit and seal very well. This is a convenient and economical 2-filter set, as both filters get replaced at basically the same one-year interval. I recommend this filter set.

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Reviewed in the United States on December 22, 2025

PJ Rufus

Chelsea, US

★★★★★ 5

Fit my 2018 CRV 1.5 turbo

I’m not a car expert, my maintenance expertise involves air in the tires, adding oil and washer fluid, and these filters. Found a video to show me how, it was easy. These fit my car, and I don’t see any difference in these and the filters they replaced, except of course, these are cleaner. Very happy.

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Reviewed in the United States on December 23, 2025

Verified Purchase

D. Henry

Draper, US

★★★★★ 5

Good Fit for 2025 Honda CR-V EX-L

Very happy with purchase. Fit like a champ. Be prepared to work to change the engine air filter. It is more about Honda's design the the filter itself.

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Reviewed in the United States on May 11, 2026

BeerMansin

Cuba, US

★★★★★ 5

Very durable and quality produced.

These filters seem very durable and quality made. The air filter looks exactly and feels exactly the same on the factory filter and very easy to replace. The cabin filter was also very easy to replace. This cabin filter feels a lot heavier and higher quality than the factory OEM. Be sure the rigid sides of the filter will fit on the left and right side when installing. If you try to install the filter with the information written on it facing out, then the cover will not fit properly. When the filter is in place correctly, the cover will be easy to put back in place. Both filters seem very durable and quality made.

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Reviewed in the United States on February 21, 2026