I am thinking about chopping off everything including the mufflers and wonder if there is an electrical connection to my npp gizmo or if it is a mechanically run set-up. If it only opens above a certain rpm, that sounds like there must be electrical control??? I still cannot believe GM designed a system that gives 6 h.p. for $1195..... I hate the way exhaust tips look and think I want to just run two straight pipes out the back. OLD SKUL RULES!!!!!