Reviewed By Clark W (Dayton, OH) Reviewed for a 2002 Porsche 911 —1/3/2013 7:59 AM
I have always used K&N filters on all my cars. I just recently installed a dual set of filters on my Porsche 997. I didn't expect such a noticable increase in torque and horsepower. So, I was pleasantly surprised after installing the filters and taking that first test run. I didn't want to get to indebt with a cold-air system on this car, so the K&N filters was an Easy, yet effective alternative.