I have 1996 7.3L turbo with 184,000 miles on it. I did the fpr shim, I got 80 psi. I am going to buy the HPX line too. I also am fixing to do the 6637 mod, which I am going to get from napa. What do i need besides the air filter to hook it up? I also want to get a 3" downpipe, where is a good place to get one? Is there any other easy cheap and easy mods I can do? Any help would be appreciated.