I don't want to say anything to the detriment of merit, it is probably real good exhaust. However when you reduce flow resistance for hot gasses, automatically you have less heattransfer within the engineroom. However, to cover the headers with heatresistant insulation adds to the same. Seen it done many times before, with the beefed upp Subarus end Supra turbos for example.
Since I have the Borla, that also reduces the heatcapacity under the hood and has less flow resistance than the standard, I also believe I see a reduction in overheating. In fact, my car doen's get over 200 very often, despite I drive it mostly in Florida and often pushing it... :biggrin
All I'm trying to say is, this discussed exhaust here is not like a fridge but achieves a thermodynamical standard phenomenon, that other flow resistance reducing sport exhausts do aswell. However, potentially to a lesser degree though, not clear until it would be measured..
Insulating the heat dissipation from the hot pies in an engine room always make sense. Anybody wrapped the pipes with teflontape or something?