Ah thanks for the idea. If wrapping thermal insulator around the bushing solves it, I'm more than happy to call that a solution. I don't have a lot of options because how I did my exhaust, I need constraint in all 3 axes, whereas stuff like that OEM hanger only offers true constraint in two axes.I have the same problem with the Summit silicone hangers. My "temporary" fix was to double-wrap the fiberglass on either side of the hangers. Thermal radiation from the pipe seems to be the primary killer; so even though double wrap is not recommended for the tubing, it keeps most of the heat off the silicone.