Hey I am still fairly new to the sight, I don't have d-max yet but it is in the works, as I am in the process of switching jobs. I am currently employed as a GM Technician. Anywho several of my buddys do have Dmax's. I am trying to get an idea on what to do with one of them. It is an 04.5, that has a straight pipe and an air filter, other than those two stock. Anywho he drives the hell out of the thing, and can get it to set a 1093. When I drive it, I cant get it to do it. It pulls about 3.5" of vacuum at an idle. At steady 60mph cruising, roughly 8.5", heavy acceleration 13". I have changed the filter, when I drive know problem when he drives it he can usually get it to set a 1093. Those of you that have shimmed the fprv for this problem, has it taken care of it, with no other faults? Any input will be appreciated.