The aftermarket decals on eBay are supposed to be "High temperature" but I doubt they'd stay on an exhaust tip for long
Saying that, those calipers can get pretty hot too and there is no sign of the decal peeling off.
Had you been ragging the V8?
I'll have to check how hot mine is next time I take it for a good run. - I've definitely burnt my fingers touching the brakes.
The normal operating temperature of a catalytic converter is 650 to 850 Celsius. They glow orange when fully up to temperature.
... That's the reason most modern exhaust tips are actually shrouds around the pipe itself, with an air gap so that the venturi effect pulls in cool air around the funnel of hot air, to keep the "fo sho" exhaust tips from getting too hot. They still reach dangerous temperatures though, as seen above. Don't forget skin burns at just 70 degrees. The severity of a burn isn't down to the temperature, it's the amount of heat that can be dumped into the skin at a given temperature.