Up until the introduction of Audi R8, Porsche C4S and TT really do not have a competitor in their price range. The closest thing that comes to mind is an SL55 but that is more of a GT (heavy) rather than a sports car. IMHO, the R8 offers a porsche-alternative to potential porsche buyers looking for more "emotion", better engine sound, supercar or semi-supercar styling, and realiability of a major German make. I think the R8 will do it. Similarly, I think a v-10 R8 will be able to battle and take sales away from tt. At least it has an effect on me as I am considering it. Porsches are fine cars but Porsche's problem is they just meet the customer's expectation rather than exceed it.