Inside the building with 3 walls of separation, you'd hear it in the walls from a block away. Then you'd hear the notes when it was on the road in front ~100ft. Outside the building you'd hear it about a block and a half away. He kept his windows down or it wouldn't be quite as loud. I see his car around a lot, just only hear it in certain areas so I've got nothing against him. Nothing wrong with a bucket list, but framing it as noise radius is gonna raise some eyebrows lol. 5kw and custom built box you'll need a permit with the windows open. I reckon his is a little more powerful or the same as the one jt4x4 described. Yukons and Escalades make pretty good installs when money's no limit.