Before i contact bully dog tomorrow, i was wondering if the Bully Dog Power Pup that is compatible with 6.4 and the 6.0 can be used to tune a 6.4 and a 6.0 at the same time? The tuner is used to tune my dad's 6.4, but i was wondering if i could take it and tune my 6.0 by selecting "press N for 6.0L" instead of "Y for 6.4L"? Would i have to put the 6.4 back to stock and then tune the 6.0? Or would it mess up everything and i not be able to tune the 6.4 again? Or would it not tune 2 different motors at the same time? Cause it give me a choice on which motor to choose everytime we re program the 6.4. When we select 6.4 it has the VIN of the 6.4 locked, but would it make the 6.0 tuning impossible being that it knows the 6.4 VIN?