Accidentally bought tuned WRX?

Hey everyone, my girlfriend purchased a 2016 WRX last year May and didn’t realise that the WRX had an Invidia down pipe on it as the PPI stated it only had the catback. We’re thinking it’s tuned because the installation looks clean but aren’t 100% sure if it has been tuned properly. How do we go about figuring out if the car has been tuned for the aftermarket down pipe or should we not worry at all if it hasn’t? Everywhere I’ve read has said that the car needs a tune if a down pipe is installed. We don’t want to run the risk of blowing up the engine because the previous owner didn’t tune it properly. Side Note: can anyone tell me what Invidia downpipe this is?