It’s very loud and may not be for everybody. If you are an older more responsible adult, this may not be it, unless you pair it with a resonator midpipe or some similar solution. The reason being is that on the highway this thing drones, half an hour of listening to that and you will get a headache if you are an older driver. So maybe use earplugs. This is something to consider also if you have child passengers, so using the car on long road trips probably out of question. You need a second normal vehicle.
Another issue if you live in a big city suburb, the neighbours will definitely not appreciate this. The cold starts were already too loud on stock mufflers, especially if you leave early in the morning. After installing these they became just too obnoxiously loud to the point that you can’t have a conversation with someone if you stand together and talk to each other near the car, you simply won’t hear each other. Finally, if I come back home after 11 pm, I have to basically drive 30 km/h in 50 km/h zone so that it stays reasonably quiet. Overall, very stressful.
So the experience is more like 2/5 stars. But there is no problem with the product as it is of high quality, and delivers, well more like over delivers. It also looks very good. I would say in general suitable if you are under 40. But beyond that, you decide. All the reviews on YouTube are mostly by younger gentlemen who very shamelessly underestimate the droning from this thing. Keep that in mind.