With ecutek the dealer can still read it, I know this because my mitsu dealer has changed and reset my immobilizer codes when I switch between ecu's.

Everything the dealer's mut-2 tool does is above the level of ecutek and ecuflash, they cannot see and or change or read the actual tune itself, just broader other details.

Scorke

 

i only have around 900 miles on the car, haven't even changed the oil yet... will this have any effect on the tune?