I got my Berk Dual exit muffler delete today. Couldn't be happier with it all. I loved my original Berk Delete, but didn't really like the single exit for aesthetic reasons. So now with the dual exit I get the best of both worlds.
Quality of the part/construction/etc: This feels like a solid piece. The flange is very thick. All new hardware and a gasket is included, as are hanger locks to keep it from sliding off the hanger.
The tips look great. The welds look nice. Everything is simple but well done. No complaints whatsoever.
Installation/Fit: Install was a breeze. It took me 15 minutes and I'm currently one-armed (broken shoulder on other arm). The fit is fantastic. Everything lines up perfectly and it looks like OEM+ in there.
Sound/Performance: It sounds a lot like the single exit delete but it is a smidge louder. No drone at speed. Nice burble. Not too loud for daily driving IMO. Here's a stationary video. I will get a driving video up soon.
[ame="http://www.youtube.com/watch?v=hbrJskM7gs8"]BRZ with Berk dual-tip muffler delete - YouTube[/ame]