I think red painted ones are. It's like they are trying to copy the Type R engines or the Ferrari Testa Rosa or something.

Yellow and the like are gaudy enough on their own.

Black is good, OEM or painted, along with gunmetal and other shades of grey.

Chrome is way to "bling bling."

At least that is how I see it. Mine is flaking OEM black. I fail to see a good reason to repaint it. :dunno: