Is the EGR plate before, or after the turbo? I can hardly remember. If you inject after the turbo, you will need to have something capable of overcoming the boost pressure, if you inject before, you will want a very fine spray so you don't create impeller sag. I am also throwing around the idea of water injection for my car, I am going to be starting on the project shortly, I will let you know how it goes.

__________________
1984 300sd auto with 246,000 miles