Originally Posted by Josh@STILLEN

While Nissan has definitely built a great platform, there are gains to be had from aftermarket products, including the intake system, our Gen 3 Intake having notable success in increasing horsepower, and making a noticeable improvement in acceleration along with transforming the sound from the intake, especially at high RPMs.

A quick search of the forums for dyno results on the Gen 3 Intake should give you some independent results from forum members here, some of whom have spent a small fortune for the good of the boards documenting their installs and resulting performance gains.

On the K&N side, we've been using these filters with our intake systems since the beginning, and sold countless panel filters, and have had exactly ZERO problems related to MAFs, oil, etc. K&N has been hit with a myriad of claims, most of which can be attributed to 'internet rumor', so much so that they set up a division and research arm within the company to attempt to combat these (largely unsubstantiated) internet claims.

Also keep in mind that normal cleaning procedures for panel filters is 50,000 miles, and conical filters used with air intakes is 50,000-100,000. We recommend 50,000 miles between cleanings. Even if gains are minimal on a panel filter, the convenience of not purchasing paper filters more than offsets the cost of the K&N, and in actuality, probably the Gen 3 Intakes if you consider the life of the vehicle.