Originally Posted by Mike@Diablosport

What footprint are you referring to exactly?

We have done our homework on this. We have confirmed time and again that we do not alter/change/edit anything to do with the CVNs, which is what GM advises dealer techs to look at to determine if a vehicle has been tuned.

We leave no trace of having been there

Originally Posted by Area47

GDI engines tend run an average of a point leaner than port injection. In all of the ones I have personally calibrated, even under 22+psi the average afr is 12.16-12.8 on gasoline. Running high 11's low 12's on a gdi setup is going to cause an injection timing issue and possible misfires. At least in my findings.

Originally Posted by gamble686

Every time the tune is pulled or reflashed it leaves a history of it having been removed and replaced unless it can someway be made to appear as though it was done with a dealer tool. I am not saying they will notice it, but if they look hard enough it can be found.

Originally Posted by yzriders182

GM has a flash counter so the dealer can see how many times the pcm has been re-flashed. If a high number is in it, it raises questions....