If it's a Mase tuned S2K, then it's 700whp. Mate of mine had him over to tune his teg powered CRX, the guy knows his stuff.
Last I heard they were just putting the finishing touches to the S2K turbo kit with a view to selling them over here, then Mase does a 2 night stop over to set all the cars up properly. There's a fair bit about him/the kits on the S2KUK forums.