K&NHigh-Flow Original Lifetime Engine Air Filter: Increase Power: Premium, Washable: Compatible with 2007-2020 Infiniti/Nissan: G35, G37, Q40, Q60, QX50, 350Z, 370Z, Fairlady, Skyline, 33-2399

I've had K&N filters on virtually all of my cars & motorcycles for many years & am more than satisfied. Gas mileage & power seem improved, but money saved is equally important.

I have had K&N in every car that I have owned. The best air cleaner out there. I have always liked how you can clean them let dry,re-oil and install back into the car. the cleaning kit is not too bad on price and you can find it at any auto store. Hold any air cleaner up to a light and look through it next to a K&N and you will see the difference! Its plan as day. Very easy to install on my new to me 2010 Infiniti g37 sedan. I had them both installed with warning stickers in less then 5 min. Worth the up front cost because i will never have to buy another air filter for this car again. My last daily driver has 250,000 miles on it. That car I,m passing down to my son. It still has the K&N air filter on it that I installed when it was new.That K&N air filter looks like new after I cleaned it,re-oiled and installed. I'm 42 now and will have this product in every car that I every own until I'm gone.

I put these in a 2009 G37x which requires two filters so be sure you're buying two if needed.Anyways at certain lower RPMs the car felt a little sluggish so I decided to check out the filters & they were cheap restrictive looking filters so I bought K&N put them in & went for a drive and I could feel the difference in acceleration and "get up" in the lower RPM range the throttle response improved I was actually surprised. They look much better quality & I could see how the air flow will improve just by comparing this filter to the one I got with the car.I would recommend, it's worth the money in the long run. Eventually I'll get a cold air intake but meanwhile this will do lol

Great and awesome! Very tight fit so just be careful installing!The packaging and website tells you, you can wash these and rinse the filters for reusability! Worth the price for my Z to breathe!

K&N is a quality product. But definitely a tight fit for the G37! Push on the latches to get it to hook onto the airbox.

After keeping track of my mpg for almost 10k miles on the K&N filters, I can honestly say they performed better than I was anticipating. I do 50% of my driving on busy but flowing country roads 55-65 mph with few to no complete stops. 35% congested City, and 15% highway. I'm averaging 1.9 mpg better with these filters installed. I can't speak to any horse power gains as I haven't put the car on a Dyno. Sometimes I think it might be a little peppier, most of the time I'm not sure.

Ok so when I say SOUND i mean very little sound that you will somewhat notice. You will notice that slight intake suction sound. They fit great on the G35X, the old ones were SO dirty, that adding these guys did make the car feel like it needed to adapt for a few miles to the added air. Once it was added, the car definitely felt a bit peppier, to the point were the lower RPMs actually seemed a little jumpy and not as linear. Gas mileage has gone up 1.2 MPG (not a huge increase but that may be the result of the dirty filter)Would I recommend? Yes, you can clean them out more and know you don't have a yucky paper filter.

I’ve been a supporter of K&N products for years. These filters are amazing. I felt a huge difference in the way my QX50 felt while driving virtually overnight. The airflow has improved with the overall general fell how my vehicle feels on the road. It hadn’t been 3 months from my oil change when I replaced those filters and they were already almost fully black. This is one small investment that will last without any worries.