Nope doesn't make any difference at all...

 

Nice review... I was already considering VMP and this might nail it down for me... the only other worry is my remaining warranty (about a year) and what kind of grief Ford will give me if I run a custom tune and need any sort of related warranty work.

 

Im pretty sure the factory setting is saved onto the tuner once its plugged into the computer so you can put it back to stock for a warrenty issue!