K&N High-Flow Original Lifetime Engine Air Filter: Increase Power: Premium, Washable: Compatible with 2005-2020 Scion/Subaru/Toyota: FR-S, TC, BRZ, 86, Corolla, GT86, 33-2300

Great quality, easy to install.

Very easy to install. I have a 2017 BRZ with 1,000 miles at filter change. Before install keep close attention to the how the old filter is positioned, because 3 corners are rounded, and one corner is L-shaped. The K&N filter also has one corner L-shaped so position that corner on the same side as the original. I watched a lot of YouTube videos on how to install, but it came down to unclipping the 2 clips on top, open the rear cover as far as it could go, removed the manufacturer's filter, checked the cleanliness of the inside of the intake tube area, and slid the new K&N filter in. The opening was wide enough, and I was careful not to damage any tubes, wires, or sensors. Made sure the gasket of the new filter fit within the grooves of the housing. The K&N filter is lined with oil so keep it in the plastic until you are ready to install.I have no access to a dyno - so no way to measure HP gain; otherwise unnoticeable. However, there is a noticeable gain in throttle response. I also noted my mileage before install at 33.5 mpg, and after driving for 2 days with the new filter I notice the average on my dashboard display was 34 mpg (no change to my driving routine). I am getting higher avg. mpg's, because I am not running my AC since outside temps are still quite comfortable.

Its a reusable air filter the gives a few HP gains (according to the dynos floating around the web). The power likely isn't that noticeable. I installed mine in my 2017 BRZ. There is a deeper growl at the top end of the RPMs. These pay for themselves after a couple washings compared to buying new filters so why not. We get too much rain and flooding in South Florida to risk hydro-lock with a cold air intake. This is a great compromise.Be aware, the install is slightly more difficult than I've seen in any other car or bike. With this filter/application, you need to take the whole air-box out of the car, separate the clam-shell box and slowly and patiently work this filter into the box while closing it. Be very careful the filter doesn't bow in the box and create a gap at the bottom where dirt and debris can work itself into the engine. There is a thick rubber skirt around the filter that seems to be a half-inch too big for the box all around. That's apparently normal. Be patient and don't hesitate to start over if you think it does't fit right. You'll know when it does. And you can check through the snorkel hole (dirty side) to see how well the filter is fitting inside the box.

Filter fits in my 2006 Scion tC perfectly. Took me less than a minute to swap the old air filter out, put this K&N filter in, and close the hood.I've driven the car for 2 weeks with the new filter now. There is noticeable better response and more thrust when I push the gas pedal. There is definitely a slight gain in HP. On the other hand, I also see a very slight gain in gas mileage, about 1 MPG. Note, I drive mostly highway.All in all, I highly recommend this air filter. The $50 price tag made me hesitate at first. If you feel the same, just pull the trigger. This longer lasting, washable air filter that also provides slight performance improvement is definitely a better value purchase than regular air filter.

My car has a stage 1 93 octane tune from openflash tablet however after and while installing this filter I noticed a few things:1)Throttle response slightly quicker basically a light throttle tap responded slightly quicker than the OEM filter2) slight sound difference at low RPM, in the lower rpm range (under 4k) the engine sounds smoother and resonates a bit less in the cabin3) the design of this filter is way better side by side than the cheapo cotton like denso filter into the car stock, this simply looks and feels like it filters more contaminants out efficiently4) As for horsepower increase that's negligible I noticed none other than a throttle response increase its a drop in filter anything under 5 HP is expected any more and its a blatant lieAll in all its a great buy although some of the claims can't be really substantiated without a dyno but there is slight differences you can feel for the better

This is the second time I've bought this same air filter.2005 Scion tC: Purchased mid-2010Noticed a bit of a noise change, but hard to truly pick up, and slight MPG change.2014 Scion FR-S:It can be argued back and forth if this truly adds any noticeable performance gains in HP and Torque for days. What I really noticed was a slightly raspier intake note and a small but defined increase in MPG.In both, the big reason I bought this was not needing to replace a paper filter repeatedly. In the FR-S, due to the location and truly immaculate engineering from Toyota and Subaru, I actually think you can't beat the bang for the buck performance increase this provides. I've read enough dyno-reviews to believe there's ~4HP in this, versus ~6HP in a cold air intake pushing or breaking $300. Hard to argue here considering how cheap this is.

My 2005 scion TC is the third vehicle in which with a K&N filter was installed.As other reviewers mentioned above, this is a good filter with somewhat less restricted design for improved airflow. It's most important feature is that you can clean and maintain it as often as you want without having to replace it.You simply cannot expect a high performance gain from a filter installed in the stock filter box, in a stock, low-rev engine. Yes, it sounds better at high rev and maybe adds a couple of HP, but that's not really noticeable in an engine with 160HP to boot with. Even a CAI would not benefit that engine that much - not without a proper ECU remap. With that combo you might be flirting with 2 digit gains (like 10% best, with a good mileage penalty tho).So buy with confidence that this filter is not magic...4x stars exactly cause they exaggerate a bit in their site about performance gains...