I sprayed my calipers red 5+ years ago, and they have held up surprisingly well. Actually, you would never know they aren't powder coated. I spent about $40 for the Porsche decals, red high heat spray paint and high heat clear coat.
For $317, you could get them powder coated, and it wouldn't be plastic. I would also be concerned about clearing the spokes with those covers installed.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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