I have the UR mini muffler with an Invidia N1 and it's fairly loud...but this is on a built platform. I also listened to videos on YouTube and it doesn't at all sound like them, lol. It's super throaty and the drone killed me driving from CO to AZ.

 

You can install sound dampening inside your car if you want. It'll also reduce road noise inside the cabin, but it'll add a little weight to the car.