The header alone, in any light, is of extreme value... I think I read it was bought new too (relevant or not, that's like a £1,200+ piece).
Even on the second hand market, it would command exceptional money and factored into the cost of a B18C, which is technically what this is (as the EUDM C6 Mani/ECU are no longer present) - it's a very fair price with the quality of everyhting else that is provided too.
In my humble opinion
GLWTS. I would have this off you for the price (although a cheeky ONO would be made) if I had a B16B to exchange.