have a comp on my 02 HO ,but without the wire tap,as a adjustable EZ with the ability to turn it off. I noticed right away that when at driving speed on the hiway the enginesdiesel chatter makes a surging noise -louder,then quieter,over and over as long as the box is on. Like the timing is constantly changing. having the cruise on or off makes no diff. was wondering if all boxes do this??? edge,banks,... etc..... ,or if theres one better than the rest for this?? any answers appriciated. thanks,LUKE