I was looking at the "Diesel Power" magazines, according to the article last month on the big black RBP truck, they claim 400hp to the ground. I don't know if that is true. In the newest issue, the little red shortbed truck they say it has 474RWHP. It has an intake, exhaust and a programmer. I have to admit I haven't seen many 6.0's on the dyno so I don't know if these #'s are valid, I know in another post on here a guy is saying 504? with NOS on the 6.0. I sent an e-mail to the editor of diesel power magazine, but he hasn't responded. I was asking if they have any real proof of these #', for instance, dyno sheets. What do yall think?