I was the first one to install a sprint booster on a 986. Go here for full installation pictures.
http://forums.rennlist.com/
Once on the forums, go down and click "Boxster and Boxster S"
Once in this, go to the "search this forum" and type in Sprintbooster. My install post will be there.
I love mine by the way. No throttle hesitation at all now.
Jon