Tell that to the purple C4 I saw at LimeRock last time I was there with the BMW guys. Cossey, Cazwrx, and others were there that day too. The day cosseys ringlands let go as a matter of fact IRC.
Was one the 3 fastest cars out there that day. Next was a NASCAR Craftsman truck. The vette was retarded fast and setup very well.
But, “street” c4’s really are not all that good.