I got rid of my Jeep and bought a 04 V8 4runner Sport. My question is how much difference is a K&N filter from a Amsoil airfilter. Are there big difference/noticeable difference btw the two or not? Any links which pit the two air filters against each other.

 

by far stock is the best as it filters out the most.

next best would be amsoil and then k&n will be somewhere way in the distance.

Gadget (resident member here) has done extensive research in this area so please visit his site for more info:

www.gadgetonline.com