K&N Performance High-Flow Engine Air Filter: Washable, Multi-Layer Protection, Engineered to Boost Horsepower, 33-2201

WOW, I put the filter in my 2007 Hyundia Tucson 4-cyl. yesterday and noticed the difference, like now, just took a 60 mile ride today, the car rides sooo much better, its really wierd how just an air-filter makes so much difference, I should have done it years ago.. thanks K&N..

I replaced my OEM filter with a K&N high flow filter in my new 2006 Elantra GLS last week and immediately noticed the difference.  Quicker acceleration and most of all a significant improvement in gas mileage.  My engine is running smoother and the transmission is shifting smoother.  I also noticed it gave my engine a nice sound.  When I hit cruising speed about 60mph on the highway it produces a nice whistle sound with a low roar to it.  Even when running the A/C I still get good acceleration. Thanks

I have been using K&N Air Filters for 15 years and do notice better gas MPG as well as perky acceleration . The initial cost may be higher than the  standard air filters which need to be replaced every 8-10 thousand miles, thus end up costing more out of pocket $$$$ and you're not getting a high end product like K&N. Keep the dirt out of your engine by using K&N and with a LOF every 3,000 miles and you'll be driving your car into the 200,000 plus range easy. That is why I use the product, and 10 years from now my car will still be on the road!

After installing this air system (57-1537) on my 2007 Ram 1500 with a 3.7L engine I was VERY upset@!  Up set that this is not standard on the vehicle from the manufacturer!!! What a performance difference, should be shipped from the factory with this product.  Better performance and better gas milage, about 4mpg! For me this was a two step process. I was not sure about how this would work, so I first simply bought the air filter replacement element and installed in the factory air cleaner.  Right away I noticed a difference.  So much so that I bought another one for my wife's car (2002 Hyundai).  After running with the air filters for a while, I decided to look into the air-system replacement. It took a few months for me to actually buy the system because I guess my truck in not a true 2007 but a 2007-1/2 or 2007-3/4.  The actual engine configuration is that of a 2008.  So when I down loaded the install manual from K & N's web site the crank case breather did not look like the 2007 described.  Once I determined that my engine confirguration looked more like a 2008 I was home free.  I bought the unit and just love the performance!!  With the price of gas as it is I love the extra 4 mpg as well.

I recently put a K&N air filter on my 2006 Hyundai Tucson.  I travel extensively and on the first trip with the new filter my mileage went from 24-25 MPG average to an amazing 28.950 MPG!  This was over the same route and same speeds.  The only thing I can contribute this to is the K&N filter. I am convinced!!! Thanks,

 I just purchased a K&N air filter for my 2004 Hyundai Tiburon. The gas mileage went from 26 miles per gallon to 31 miles per gallon!!  Great product!!! I'll tell all my friends and family.

Got my KN Filter in April. I drive a 2005 Hyundia was getting 28 mpg. After the filter was installed, which was easy, I am now getting over 31 mpg

Was not an exact fit for my 2005 Elantra…the air filter cover would not close and snap shut. The quality of the KN looked to be very good, however , and I am disappointed this will have to be returned,