i know its probably not something that gets said often.......... but my cummins is too quiet! i just put a 4in straight pipe on and it sounds almost exactly the same as before!....... i have not done any other mods except a cold air intake, but neither has my dad and his truck sounds deep and loud...(it has a muffler!!) my truck has always been kind of sluggish compared to his too............ is it my lift pump not giving me enough fuel or maybe cummins let this one out with the injection pump turned down further than his?.........

i just want to know why his truck is awesome and mine kind of sucks even though we have the same mods?