SO the shop im gonna get my truck tunned at is saying that i already have a registered performance tune from efi live , so my question is if i purchase the jet spectrum or hp tuners is this gonna cause a problem?

 

Is it an EFI Live custom operating system?

 

i honestly dont know . i had called to get some info from the shop and he just said it was previously tuned using efi. how they know i have no idea lol