Can depend on how much fuel enrichment you're running. To give you some idea, OEMs will typically run <12:1 to protect the catalyst which can reach up to 900C (1652F).
Now a tailpipe is far away from where a catalyst would be, but that's still a lot of heat to cool before it exits. Normal enamel paint is good up to 200F. It'd probably be safe @ idle, but at full WOT I think you'd see higher than that. I would go with a high temp paint to be sure.
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