If they know about then they can void your warranty.... never speak with them about...
We can use what's called a BDM100 system which ensures it does not show up on the diag system that they have. We need to pop the back case of the ECU off to do it but is the only way of being sure they cant electronically detect it. They have to be able to prove you have done it.... which they wont be able to.
This is what i got from a tuning company
Induction kit, that would probably void warranty!