I just picked up a 2002 GMC 2500 with the 6.0, it has 185,000 miles on it. Everything seems good on it, all fluids looked good, runs and shifts great, but has a really bad tick when it's cold. Unfortunately when I went to look at it he had just drove it, so it was warmed up and not making the noise (obvious why he had warmed it up before I got there now). I'm pretty sure it's an exhaust leak that I'm hearing. I noticed the very front and back manifold stud on the drivers side and the back on the passenger side are broke off. I have done a little research and it seems this is fairly common. Does anyone have any experience with the Dorman repair clamps that are made for this? I have watched a few videos of extracting the broken studs, but don't really want to go that route if there's an easier fix. Thanks!