The complete kit is under a grand to buy from SEAT if that helps...
But if I'm totally honest, I don't see why you'd want it! That kit should have been kept exclusive to the Cupra/R/
K1... I was originally after one but the fact that the 1.6 down the road has one with a twin-exhaust down the road put me right off. It looks like the car's trying to be something it's not...