Honestly I don't know. I mean if the dealership finds that thing hanging in the ECU I think they will have kittens. It will immediately be flagged as 'moddified ecu'. It will then be up to you to explain why that shouldn't void the entire engine management (and whatever else) warranty. Same basic deal as if they really do have some cryptic 'anti tuner' coding thing.
Here's an idea. How hard is that piece to in/uninstall? I think its pretty simple. You could install it then uninstall before visits to the dealership. I believe the car runs for XX miles before it starts to throw codes for the lack of cats. So, stop somewhere just before arriving to dealer, pull that piece out, drop off and they will never be the wiser. Remember though if they do an oil change they will drie the car 8-10 miles to make sure the fill sensor is reading max.
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