The k&n I installed on my suv did have a nice effect. Didn't notice much of a power gain but I did notice it was more responsive initially. As far mpg gain haven't seen much of one if there is one its minimal. For sound it is hardly noticeable if you're trying to drive conservatively, but as soon as you put your foot down you will hear a slight whistle and roar of the intake and you might get a hard on. that maybe why I don't see a increase in why I don't see much of a mpg gain. ??
The K&N greatly improved acceleration and significantly reduced down shifting. The 3.5 liter V6 engine is much less labored cruising on the Interstate. All in all, a good investment for the overall improved performance. My wife has noticed the big difference in performance too.The great AutoAnything price sealed the deal for us. Love it!