I'm trading my 2010 f150 in today on an 06 f250. You guys showed me what to look for and I'm pretty sure I found it. The head bolts have been replaced with studs and the egr has been bypassed. The dealer said they were told it has a HPOP but have no way of knowing for sure. I want to straight pipe it out the back and get a tuner to remove the egr code and run an economy setting when I'm not towing. Again thank you for all this information I'm sure I'll have plenty of questions because this is my first diesel.