Hi all, sorry if I'm doing this wrong. New to this. I've got a 2004 audi a3 3.2 v6, now recently I've realised that at low and normal revs, the v6 sound isn't there anymore at all, you can only hear it at really high revs, why's this? And it slightly lacks power too at low revs.

​​​​​(forgot to mention, I have a miltec so that shouldn't be an issue)