KAX CA4309 Premium Engine Air Filter for Nissan, INFINITI, Subaru, Saab

This KAX engine air filter delivers significantly more than the product description suggests. The construction quality is immediately apparent: the filter is heavier than the OEM Chevrolet filter, has greater surface area, and seals more securely without stressing the plastic airbox. The design allows increased airflow without compromising filtration capability.To evaluate performance objectively, I compared this filter against both the OEM paper filter and a brand‑new FRAM paper filter in my 2022 Chevy Equinox (1.5L turbo). My daily commute is consistent, and I monitor vehicle data through OBD‑II equipment typically used for drag‑racing analysis.Fuel Efficiency:OEM / FRAM paper filters: 27–30 mpg averageKAX filter: 39–42 mpg averageThe improvement was immediate and repeatable. To rule out placebo effect, I reinstalled the new FRAM filter for a full week. MPG dropped back to ~28 mpg. Reinstalling the KAX again restored the 39+ mpg average under identical driving conditions.Acceleration Testing (0–60 mph):FRAM paper filter: 8.7 seconds (expected for this vehicle)KAX filter: 7.8 secondsDuring acceleration, the FRAM filter dropped fuel economy to 5 mpg, while the KAX dropped to 11 mpg — a clear indication that the turbocharger was spooling earlier and breathing more efficiently with the KAX installed.Additional Observations:The filter’s increased airflow noticeably benefits the turbocharger.Fitment is excellent; the seal is firm without requiring extra force.For the price, it’s on par with generic paper filters and actually cheaper than the FRAM I purchased locally.Although KAX advertises a 20,000‑mile lifespan, the low cost makes more frequent replacement a practical choice.Conclusion:This filter outperformed both OEM and FRAM options in measurable ways — fuel economy, acceleration, and overall engine responsiveness. Based on the results, I will be switching my other vehicles to KAX filters as well. Highly recommended for anyone looking to improve efficiency and performance without modifying their vehicle.

I'm not a DIY guy, but when the dealership wanted $60 to replace this filter in my 2024 Murano, I knew that I could do much better. After some research, I bought it and it arrived the next day.There are several DIY videos on-line, so I invested 10 minutes to watch 2 of them. It looked easy.Well, it was! I replaced the filter in about 5 minutes and it works great. A+++ product for a great price!

This cabin air filter fits my 2019 Nissan Rogue perfectly. The quality is noticeably better than some of the other brands I’ve tried before, and the installation was quick and easy. It fits well without any gaps or issues and feels sturdy and well made. Great value for the quality—I would definitely recommend it.

Good quality filter. Easy to install. Do it yourself and save

Fit right, works right.... that's what you want!

Good quality, great price compared to the dealership. Will definitely order again.

Great price and quality

This filter works like a charm. It fit perfectly. The quality seems to be better than the Dealership reccomended filter. I will be buying these on a regular basis.I have No Complaints or issues at all.

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Fit my 2007 GMC Sierra 1500 Classic perfectly. I did a quick before/after install test of 20-100kmph and there was a 0.63 second improvement with this filter. To be fair, the old basic white paper filter was medium dirty. But still impressed. Truck seems to have a bit more pep.

Taille parfaite pour mazda 3 2010 gt change le son pour un son beaucoup plus agressif, beaucoup plus dair qui passe dans lentree dair

Apparentemente ottimo.Ma non è adatto per la mia Mazda 3 III gen. 1.5 benzina 100 cv 2017 restyling.Peccato. Errore mio.