Hey all! I know you all have head this question probably a billion times. But this is a billion and one. Anyway... I went down to the a local garage the other day to price out a new exhaust for my 2010 5.3. I was quoted 450 for complete stainless rebuild of my exhaust from the manifold cats back. 3 inch Y pipe to a flowmaster super 40 to dual 2.5 or 3 inch exits. My biggest concern is the "WONDERFUL" Active Fuel Management the 5.3 has... Since I do a lot of highway driving when I travel the six hours back home. How annoying does the "drone" get when the truck kicks into 4 cylinder mode. I have heard both sides. One you can barely tell anything has changed or Two the drone inside the cab can sound "industrial" like a tractor or a helicopter hovering over head. For those of you with flowmasters what are your experiences?