It's not that loud, I think the mic on the MiniDV just did a good job picking up the sound. In the 2nd part of the video, you can hear the road noise (tires and gravel) as I start to roll. Darrell (Bouncer) and I could have a normal conversation in the garage while the car was idling.
But, with that said, I'm not putting tailpipes on the car until the car is basically finished I'm totally satisfied with how it sounds not only at idle, but also at WOT. I could always end up changing mufflers.