for the FPR shim mod u put a BB like from a BB gun into ur Fuel Pressure Regulated thats on the side of ur fuel filter housing. I did it and it seems to have a bit more low end response and a smoother idle. Search FPR shim on this site. And the ITP boost anihalitor go to ITPDiesel.com It fools ur map sensor so u can create more boost without defueling ur engine and setting off the check engine light.