I used 2000 degree VHT Flameproof paint (was available at the auto parts store). Reviews online are mixed regarding all the high temp paints available, but the 2000 degree stuff has more good reviews than any of the other lower-temp options. Will see how it holds up - I painted the exhaust/cat/muffler pipes on the Jeep itself (anything visible from the sides or back or underneath). Just finished the curing process. Went on super easy, only used 1 can, kept the coats relatively light.
Honestly, the reason I did this project as because I already started seeing a lot of rust on the exhaust pipe hangers (despite this being a new vehicle) and it was really bothering me. I've noticed that for some reason even 1 or two year old jeeps have a lot of rust on their exhaust systems , and I don't want that.