Alright, I've been searching all over the web for Cold Air intake kits to go on my 2000 Silverado 5.3L 1500. Obviously some brands may be better quality or better functioning then others but I just don't know enough people with them to compare. I was wondering what peoples' opinions are on the subject. My father will always recommend K&N but I'm wondering if there are any others that produce higher then a 9hp gain. I'm looking for the greatest amount of horsepower practically possible.

Thanks in advance.