were just the mufflers changed? does it have a high-flo air cleaner? Headers changed out? if just the mufflers, most likely not, as it didn't need to be. But if the ac was changed and or headers as well, it should have been. (Well if it was someone that knew better.) Best way, to know for sure is to get a tuner, and get it tuned yourself. No worries.
I would've thought the dealer would have something in their system as well about it. However, it could have been done at an indy shop as well, so no record.
"I'd rather have a bottle in front of me, than have to have a frontal lobotomy." ~ Tom Waits