I had the Berk Race exhaust with my stock DP and it was waaaaaaay too loud. People on the back side of the third floor of my office building could hear me start the car. On the Autobahn it droned so loud that I couldn't stand to drive between 80mph and 120mph. It sounded great at WOT in tunnels but wasn't worth the headaches and extra attention.
Now I'm running a catless DP and the stock exhaust and I wish I could quiet it down a little more.