I received the D&D straight slip-on a few days ago. I placed the order 15 days before it arrived at my door, they're located in TX and I'm in Wisconsin. They actually said it would ship out about a week before it did, and when I called to inquire whether it had shipped, they were very apologetic, and then it shipped out that day. The total cost, with shipping, was $186. The box i received included the silencer, a heat-shield, and the pod air filter they recommend adding with the new silencer, (which was supposed to be an additional $35, but for some reason they sent it along w/out charge...maybe for the delay in shipping??).
Anyway I put in on tonight, which was a pretty simple process...the biggest pain was getting the heat shield to fit over the wrap i have on my header pipe; the shield is designed to be almost touching the header pipe.
First impressions: it's definitely louder and a much deeper sound. It's actually not a whole lot louder than the stock pipe at idle, but when you get on it, it's much louder.
As far as added performance, judging from the seat of my pants, it definitely added something here too...I probably only went for a 10 mile loop. The main difference I noticed tonight was the acceleration in 2nd and 3rd gear, (and back to the sound from the pipe, it's loud enough when you grab a handful of throttle that I'd be nervous doing that w/ a police officer around, I doubt the decibels are w/in the legal limit).
Anyway, I'm sure I'll post again after i get a chance to go for a proper ride and really get a feel for it, and I'm still unsure whether I'm going to install the new filter...but if i do, I'll let you guys know what that does for performance.
Here's a picture of what it looks like on the bike, not a great photo, taken in my dark garage after I got home from the ride.
I also made a before and after video of how the bike sounded w/ the stock silencer and then w/ the D&D...I was alone, so that was all I could really film. Both of the videos were taken with my bike in the same spot, and shot w/ the same device, so it should be a pretty honest comparison, (i think i must have had my hand over the microphone in the first 5 seconds of the "before" video, so after that is the actual volume of the stocker).
Before:
http://www.youtube.com/watch?v=_wJHHdihXCg&feature=plcpAfter:
http://www.youtube.com/watch?v=UuYzUoMs0Fg&feature=plcp