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I'm running a Dinan big turbo, stage IV tune, exhaust, and catless DP (previous owner installed it). Can try to get a video of it at some point (potentially at an upcoming autocross, when you can get a sense of how amazing it sounds).
First the positives: during normal driving, it's loud, but not obnoxiously so. I have ASD disabled, and you definitely don't need it on. If you've got the windows closed driving on the highway, it's not super noticeable. With music on you can barely hear anything abnormal.
However, put it in sport, roll down the windows, and floor it: it's next level. The overrun sounds amazing, and a warm start is suuuuuuper satisfying (nice sharp crack that people notice, but not in an obnoxious way IMO).
Unfortunately, there are negatives: the cold start is... ridiculous, mostly in a bad way. I am banned from a friend's apartment because I woke up a baby sleeping two floors up. My former roommate (who lived above the garage at my old place) didn't like when I left before he woke up. I set off a car alarm in my current apartment garage and had to move to a different parking spot to avoid doing this in the future (granted, it's a solid concrete box...). Friends that sit in the car during cold start ask if there's something wrong with the car, and seem very concerned that it's going to sound like that all the time.
There is a noticeable smell especially if you're in a garage, and honestly even if you've got the windows down at a light and are waiting for 30 seconds. Unsure how many years it's taking off my life, but can't be good for you.
Honestly, I wouldn't have installed it (constant CEL, difficulties with smogging, unclear benefits over a sport cat or even the regular cat), but I get why people might. I have a feeling that the exhaust and tune is 90% of the sound, and the catless DP is diminishing returns.
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