I'm pretty sure Supersprint have stopped making this particular manifold, as the one I have fitted to my car can only be used if the Supersprint De-kat pipe they sell is also fitted and for this reason, is for motorsport use only.
However they do sell another stainless manifold that bolts onto the existing kat and I know that "PhatAshKi" had one of these fitted to his car.
I bought my full Supersprint exhaust system off ebay, but if you get in contact with "PhatAshKi" he should be able to let you know how much one is going to cost.