you can hear a difference with k&n so i would have thought you would hear it with K-tec too.
the normal filter works, if the car is used heavily a lot it can end up distorting a bit in the middle which will lose you a few horses, get the better one id say
a knn panel filter make no difference to sound, ive got one and a standard paper. The filter is still housed in the air box with long air feeds on so induction noise is very minimal. Youl only hear a difference with open cone or if you remove the air feeds to the box.