More Whistle??
#11
Gauges dont lie and the insulation kept the heat inside the tube. Aluminum sheds alot of heat, but if it is wrapped in insulation it cant. This is what happened to me after I took mine off, so it is safe to say that it would do the same on any other 7.3. Strangely, the out temp was only about 5 degrees cooler, not 20 like the in temp changed.
#14
#16
#18
#20