This guide is based on the 184Hp engine, (it should, in theory, be reasonably similar to the 204Hp engine too). I've been on the forum for about two years now and could never find a usable guide for this.  Please NOTE - I am not a mechanic, this is just a guide and you will be doing this at your own risk!.  EDIT: If you want an alternate way of removing injectors without taking the manifold off, check this out: http://www.bimmerforums.co.uk/forum/f89/changing-injectors-m57-engine-not-n