K&N Cold Air Intake System: High-Flow Air Filter, Increase Performance & Acceleration: Compatible with 2009-2016 Toyota: Corolla, 69-8757TTK

I spent some time looking around online for different ways to improve my 2011 Corolla S's performance (even if applying these changes resulted in an only marginal improvement), and across the board, a cold-air intake system showed up in every list. It was hard to ignore K&N's reputation and claim to offer "the world's best air filters," along with their guarantee of an increase in horsepower, and since buying and installing this air intake in my car about a month ago, I could not be happier with the results.The build quality of all of this intake's components is excellent, which is the first thing I noticed while unboxing everything. Immediately after installing it, I noticed a dramatic improvement in the engine's sound at higher revs (3k rpm and over), and my mileage has already gone up by nearly 2 mpg. Installation was fairly easy, even for someone who's a little less mechanically-minded than most guys who mod their cars (it took me close to 2hrs between removing the old assembly and mounting this new one into its place and starting the car up again). In terms of things I noticed once on the road, there is a pretty constant but still non-irritating droning sound if you're driving at speeds anything over 65mph and don't have any way of shifting into a higher gear, but you'd have a similar "problem" with larger engines at higher rpm's anyways, so I'm more than willing to put up with it.Overall, I have been very happy with the results that I've gotten since installing this air intake, and I've already had multiple people comment on how good it looks and sounds. Put the money and time into installing one in your car, and I'm willing to bet you'll have the same experience!

I had been thinking about purchasing this addition to my car for awhile before I finally decided to, and I am very glad I did. The intake sounds great on my 2011 Toyota Corolla S and looks great as well under the hood. Driving regularly and shifting between 2-3k rpms almost doesn't sound like anything has changed but when you feel like unleashing a little speed, past 3.5k rpms, it begins to sound like a whole different car! Gas mileage, according to the car's computer has increased much more than I thought it would (I'm getting about 20-30 more miles per tank in the city, and I haven't even checked it on the highway yet). There are a couple parts in the instructions that are very difficult but once you have it properly installed and running, it's completely worth the money and time! Hope this review helped!!

The media could not be loaded. The installation took about 2 hours total, even though I had no idea what I was doing prior. The online video was super helpful. The fit was perfect, and I've noticed that my car has more power when accelerating at high speeds/maintaining acceleration. The quality is incredible.Super awesome kit, it was a great experience overall!(The video I included shows how the intake performs at high speeds, my music is at about 50% volume for reference, the intake is a lot louder than in the video)

As another review stated, there's not much of a difference noise-wise until you hit around 3.5k rpms. But once you do accelerate enough and hit that mark, the car does truly sound like a whole different car. The best part for me is that you can occasionally hear the intake suck in the air, which produces a very nice sound. Like others have said, the intake noise does make you want to speed. Installation wise, I wanted peace of mind and opted to pay a mechanic $80 dollars to install the intake instead of me doing it myself. I'm glad I did, even though I think i'm a pretty smart guy, and the intake does come with step by step instructions, there were several steps that the mechanic did that i knew i couldn't have done myself. In addition, he added several more of his own zip ties to various wires and tubes to make sure that everything was very sturdy. All in all, this is a great addition for anyone wanting to add something more to their car (the corolla can be a tad boring to drive after a while) without going overboard.

I put this intake on my 09 Corolla S, makes it...a little less Corolla-y. In the 3-4 weeks I've had it in, my average MPG has increased from 29.1 to exactly 30, and seems to still be slowly getting higher. Not a huge increase, but I'll take it. Definitely adds some mmmph, the sound is amazing. As far as a horsepower increase goes, I've noticed acceleration is a little better.The installation manual was easy with pictures to guide you through the process. It's a little tight, but still enough space for the whole thing. There was only one frustrating step, trying to fit one of the hoses from the engine to the intake. That might have just been user error, however...

You notice at first that it is a bit louder than the stock, especially around 3-5 RPMs. I don't frequently get that big with the RPMs, but we recently went on a road trip after purchasing and installing it, there were plenty of hills and mountains on the trip. Our trip went through Las Vegas when it was 110, so any major gains in mpgs weren't't as noticeable due to the A/C being on full blast. Before the trip it was on for about 3 weeks and in the two tanks that were filled there was a noticeable 1.5mpg increase. I'm excited to see if there is more to notice after a longer period of use.The installation wasn't bad. I would consider myself to be pretty average as far as mechanical ability is concerned. Take the stock filter and assembly out and installing the k&n took me about 75 minutes. I thought the instructions were clear and understandable. So far I am enjoying the product and am happy with the purchase.