On a sadder note, I spent the afternoon taking out the lining in my trunk and putting in dynamat, and it did f*** all to solve the problem. Even downloaded a decibel meter to my phone to get accurate before and after measurements. Nope. Sometimes it's echoing so loud it makes me want to unplug my ears. So now I'm going to just hope it breaks as I drive it for a couple of weeks, because I'm done throwing good money after bad. Still have the OEM exhaust crammed into my storage locker, and if it hasn't gotten to the point where the drone mellows out or I decide I can live with it by the time we take down the tree and Xmas stuff, the invidia crap is coming off and the original one's going back on.
It honestly wouldn't be so bad if it happened at 4k or 4.5k like the reviews I was seeing online; then I could choose to go there or not. But 3k is right smack-dab in the middle of unavoidable everyday putzing around in traffic.
Edit: Okay, one week later, and I *am* getting a little used to it. So far the only time I can say I genuinely like it is when the vtec and tunes are both cranked. Every other driving situation, not so much. Were I a younger man, I'd just say: hey, every time you turn the key, turn the tunes up to full! Problem solved! Nowadays, not so much. But I am getting to a point where I can seriously entertain keeping it on the car, or at least keeping it in case something happens to the car and I try my luck with a newer model.