03 sedan here. I have modded yet but at some point before my warranty is up, I'll have it modded. And I might/might not have the time to demod it every time I take it to a dealer for warranty.

What have been your experiences with the local dealers when modded? The closest dealer to me is Kirkland and then Tacoma Infiniti.

 

it should be okay to take the car to the dealer with mods. I have and the dealer has not said anything about them yet.
Good luck on finding someone in your area that can answer your questions.

In los angeles, there are a few mod friendly dealers. Not sure where you are though.