As krea.tion pointed out, I also have a very loud setup, similar components to sti-tom. Cat less Down and Mid pipes (non-resonated) and Meistershaft dual rear section.
When the car is started, it is absolutely deafening in my garage - I live on a straight street (Rather than a cul-de-sac) and it shakes the surrounding houses. My neighbor down the road, and around the corner can hear it start if he has his windows open.
That being said, I LOVE the sound. The car is a monster, especially after you do some initial modifications, and I think it needs to sound as mean as it is. I am also respectful about it - I start my car and use it whenever I want, but I wouldn't during the late evening (After 11:00PM lets say) or really early in the morning. I just don't want to piss my neighbors off more than necessary, and I think they pick up on that. I agree with sti-tom in the fact that I don't REALLY care if people don't like how loud my car is, but I do go out of my way to try and minimize the disturbance.
It also means I need to crawl into the neighborhood late night, to try and keep the sound down. No one has ever complained to date.
I've been on a few road trips, both before and after the Exhaust work. On a recent trip to Kelowna, BC, around 10-12 hours depending on the traffic, I did find the drone quite distracting. If I kept music on, it wasn't so much of an issue, but the decibel reading in the cabin was around 90 @ 120 KM/h. My girlfriend was with me, and had to bring earplugs so she could sleep - I am used to the car, so like I said, with music, I was totally fine. Without music on however, I think it would get to me pretty quick.
Given the choice to go back, I would do it all again.
Here is a video a local videographer made of the car, so you can get an idea of what it sounds like: