Originally Posted by Rekrul
I read a post in which Mike Benvo stated that the following four things are the easiest ways for BMW to tell if your car had ever been tuned 1) Exceeding Rev Limit 2) Exceeding Speed Governor 3) Cold Start Removal 4) Keeping the O2 readiness sensors ON but disabling the SES light. Whether ore not 3,4 are pure speculation by Benvo I wanted to err on the side of caution. However, I still think Evolve and Sal are also very solid tuners.. it was more a matter of personal preference.
FYI, it's your choice whether you want the rev limit changed, the speed governor changed, the cold start off and the 02 readiness on or off when you have them make the tune so I find it odd that you used it as a reason to use ESS instead when they can do the same things.