Ecutek is a flash not a piggy back. The dealer will see this if you're looking for a piggy back look for the Unichip from Perrin Performance or the Procede from Vishnu performance.

 

OK...my mistake. still, can you put it back when you go back to the dealer without them detecting it?

 

That's what I'm doing.

 

There's some concern that the ECU keeps track of how many times it's been flashed. If it's more than in the vehicle's service history, that could cause problems. Of course, nobody seems to know for sure if this is the case or not.