Duncan - I can't tell by looking at the drawing in the owner's 6.0 Supplement (that is how I found the change after three weeks finally got around to looking at the book). There are some other changes in the Supplement that I don't remember from the 04 book but my friend will have his at work Monday. There is a big warning about tuners in this one and another that says cetane improvers from a reputable manufacturer are OK.