WOW! That 6.4L is a tight fit! This was not a production unit, but man, talk about a new learning curve concerning servicing! It looks like everything we were hearing is about right. The series turbo (I don't like "twin turbo") setup with the small one feeding into the large one. LOTS of plumbing, but that might get cleaned up some. We were told it's basically the same block. It's just a question of when the 2007's get released next year. I will have ask if I can get some H.P./Torque specs.