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Ceramic last longer, and traps in the heat. So your underhood temp is lower. Most companys that sell ceramic headers offer a long warranty.
I was amazed how my coated hookers actually reduced temps. I was worried headers would increase underhood temps but you can actually touch them after only about 8-10 minutes of turning engine off. Never could touch the stock manifolds that soon. I remember having to wait like 45 mins for stock manifolds to cool just to change plugs.