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It might be hard to say without seeing it. I have a Steeda spoiler and CDC chin, but as you said, I don't think that is the level of mix and match you were wondering about. I guess it would depend on how the two flow....
Personally, I'd absolutely leave the Saleen as is... It's a beautiful car IMO, one that definitely looks better and more intimidating than a GT500 in a person's rear view mirror.