I disagree a bit. It may not sound very well, but without it (and 100% stock exhaust) it sounds even worse, dull, lifeless. Yes, i know, that power/performance is completely same, but after testing with plugging it off, i reverted. Even if it's just subjective placebo feel, car felt slower & less powerful
.
I do agree though, that good aftermarket catback and sountube-delete will result in much better and more pleasant sound, but it costs .. slightly more.