Looking at getting a 2008 F250 6.4 Powerstroke with 177k miles on it. It has had the DPF amd EGR delete done as well as been studded. Just curious for anything to watch for while checking it out? Ive been driving a 7.3 Powerstroke for years so im familiar with diesels but not up to date on the pros and cons of the 6.4