My brother bought a 04 6. 0 4x4 powerstroke f-350 with 99,760 miles on it and it is bone stock other than exhaust and intake and 6in lift with 35s. I have not seen the truck yet since I'm stationed in MT and he is in MI bought he said it sounds like coolent boiling everytime he gets on it but the sound gets stronger by the intake? I have no clue about 6. 0 powerstrokes other than they have weak head studs and that I would never own one. If anyone knows anything about this please put in your comments even if its a guess cause yours is probably better than mine.