Yes, they can all be detected. There is a change-code in the computer that no hand-held tuner or even the big guys have access to. If you modify anything, that change code will raise a flag.
I'll work on finding the thread on this. There was a big controversy over it.
"Keep the faith."
- - Read Before You Post.
Past: 2012 Camaro ZL1 (For sale through Tom Henry Chevrolet)