Red bushings make your car faster than black ones, much like a big "R" sticker on the hood would make your car scoot. Or a big ol' wing on the back, those are good for at least 40hp.
Seriously tho, any polyurethane is better than the factory rubber, it is more difficult to compress, so it reduces unwanted movement at the arm in hard corners.
Hissin50 is correct, it would be easier to just swap in some kickass control arms, and they should come with poly anyways.