We recently finished up this install of 20x9.5 F14s for our customer's Sepang Blue RS5
We went with offsets to match the OEM wheel fitment w/ spacers, and a Gloss Black powdercoat to match the Black Optics package
He reused his OEM tires, and when we compared the F14 weight with his OEM 20" rotors, he saved over 5lbs per wheel!