Mel:
Jim and I went down the same road on the E series. Heat in the doghouse. 'Without the wrap both the up and the downpipe will transmit too much heat to the doghouse. Exhaust gas dense flow is a bonus. If you get the conventional you won't get off the line thrills, when the thing spools up and at roadspeed towing it is fine. The turbo has made a decent truck out of a real lead sled. You, of course, have the F series and if I had one it would have been a waste gated turbo. Fit and finish on my kit were poor, turbo has casting flaw and wrong parts were sent causing delays. When I asked about possible cures for the excess heat in the doghouse I was told my wife should carry a fire extinguisher. Charming - hey, I droped 2 g's here. Oh ya, if you want low or decent egt's you must open up the exhaust, I wound up with a 3" into a straight through IH tractor muffler, kind of nice sound. I was always told if you couldn't say anything nice don't say anything but were talking serious money here and it's the only way poor product, and indifferent service will change.