Project: 2014 328i xDrive Wagon F31

[GTBrandon]

My tune was undetectable by the dealer

I would be VERY surprised if this was true.

Only thing they can see is the bolt ons which can lead to assumptions but no proof. Depending on your dealer, you can just take off the downpipe/intercooler if you are having anything big replaced.

My transfer case was replaced with no questions asked and this was with my tune on and all bolt-ons still in place.

Edit: depends on the tune. A simple JB4 is detectable, I’m talking about a full ECU re-flash.