Ya'll should really spend some time reading the posts on this forum:
http://www.aquamist.co.uk/phpBB2/index.php?sid=809379a7b37931443e5e5807dbdfd330

Lots of good stuff.  I've been researching this for my hotrod Mercedes
turbodiesel.  For diesels, WI doesn't add any power (unless augmented with
methanol [windshield washer fluid]), but it does help to reduce EGTs.

Look up both Snow Performance and Aquamist, as they each have electronic
controllers for sophisticated dual stage injection systems, and such.
Enjoy!

Casey