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I didn't think Prodrive had anything whatsoever to do with it.
Neither did I, but the OP posted Prodrive CS400, I thought it a bit odd that two seperate tuning Co's collaborated together considering they are technically rivals, but stranger things have happened I guess.
Subaru & Prodrive parted company
This was a new venture between I.M & Cosworth.
Seems that Cosworth are now supplying "approved" parts also from what I can make out.