PCV/EEC/Fuel hose is rated for -40°F to 257°F. Considering the CHT on my SHO never rose above 220F, I'd say the hose would be fine.
Although GM does use a lot of braided hoses on their GTDI engines, at least on my LNF, mainly the breather line and PCV/turbo inlet line probably because they sit right next to the turbo. On the SHO the turbos are fairly far away from these hoses.
After reading about Livernois's response to the whole catch can/separator craze, I'm going to remove the JLT seeing how its not catching any oil. Maybe on another application it would be worthwhile, but it looks like the factory oil separator is doing its job. I'm also not seeing any reduction in knock retard with the JLT as it is collecting all of the vapor byproducts, so what's the real point other than take up space and weight?