I've done this to my last couple of cars, and it has worked well:
1. Clean the muffler very well, to remove
any surface rust and debris.
2. Buy some high temp. engine/header
paint, any color you'd like.
3. Paint your muffler, but avoid clogging
up any weep holes the muffler may need
for draining purposes.
I did this on my old Accord, and after three
years, the muffler still looked new when I sold it.
As far as the tips go, I guess you'd have to
buy a quality aftermarket set, unless engine
paint comes in chrome.
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2001 Sentra SE, PP, 5-Speed, Sunroof.
PR CAI, Kenwood KFC-1738Cs (rear)