Warranty issues with a catless header???
 

Anyone get any trouble at the dealership if / when you get maintenance or repairs done? Anybody get told it voids and type of warranty repair??

They have to prove the mod directly affected the problem. However you are modifying a working emissions part but that might be another can of worms

I took mine in after headers and a ECU re-flash and they didn't say a word to me about it.

Rule 1 of warranty: build a relationship with a dealer.

What items you are denied coverage on will depending how much or how little of an ass you are, and how well you understand how warranty is provided in the first place.

-alex