OK, I talked with my service manager this morning and asked him if he had made any adjustments to my Xfire last week. He said everything is adjusted by the computer, there are no manual adjustments he can make. I told him I had a big jump in power and had other owners say the same thing. He just smiled, said he was glad I was happy but, it had to be some change the computer made. I could not get him to say more after that, he started talking about how great my car looked, etc. I still say they know what happens and are not going to make it public or DC knows and won't share with the dealers. Anyway, I'm happy with my ride and can't wait until the next oil change to see what happens then !! !!