I have a 2005 3500 single axle with the nv5600. The mods are a 165 gph air dog, aftermarket 4 inch turbo back with muffler, egt and boost gauge, and cold air intake, fixing to install a south bend dual disk capable of holding 550hp and a smarty s06 pod. I'll tow mostly a 12k pound trailer but every once in awhile a 20k pounder. I want to put about 500 horse in it and not have to worry about crazy egts and that way the clutch will still be able to hold it. Open to any thoughts at all rather it be hot tunes on stock injectors and a bigger turbo or bigger injectors with a bigger turbo. I'd sell the smarty and buy mm3 if need be also.