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No paint will stick to the muffler very long. If you want it to look pretty, you could spend a few extra dollars and buy a stainless steel muffler. But who can see your muffler anyway?
I use that bake to cure 2000F spray paint on my snowmobile pipe with good results, but need to redo it every other year. That doesn't see near the road grime, dirt, and heat a truck muffler sees though.