NO, NO, NO! You're not allowed to have Red Calipers without buying a S.
Just Kidding.
Nice job on them, haven't seen the red on black. I think the Red would surely stand out more. Alot of base Boxsters have painted them. Like the others have said, it's yours, do what you like.
I love the cf inserts, I can't find them with the S added on without paying $600 for the factory ones.