I just installed the Titanium 2 Bros M5 pipes and I love the look, and the sound is fine. I wear plugs when I ride and I don't see the need for the baffle inserts they sell. Personally, I like the 2 Bros look with gold accents, and gray color.
I paid $780 delivered from our favorite internet site: newenough.com. They were the lowest around and the shipment arrived in about 3 days after order placement. The best I could fine on the Staintunes was about $200 more.