8 Injectors will cost you around $ 1440.00 You might be able to find them cheaper some place else, these guys have them for 180.25 each.
Part# 13537585261-11
http://www.rmeuropean.com/bmw-parts.aspx#Category
Found better pricing with ECS:
http://www.ecstuning.com/BMW-E70-X5_...uel/ES2807627/