hey i am new here i have a 2005 sierra 5.3 z71 4+4 crew cab that i have done nothing to. i am thinking about adding a k&n filter to increase hp. what is the diff between a model 57 and model 63 in terms of which would benifit me more in performace gains. sorry i posted this on the chevy forum but the gmc seems to move pretty slowly. also any other brands would be considered it just seems like K&N are the best performance wise. also would a air intake tube help any?