The 2Bros is awesome. Kind of pricey but well worth every penny. The sound is amazing, I'm actually contemplating putting the silencer in because it's is LOUD. Performance-wise the gain is noticeable but if I had the JuiceBox I think the gain would be better.
As for installation, I had my dealer do it because I didn't have tools or a place to store the stocker at the time. I don't think it would be hard though, the instructions that come with it seem fairly detailed. I've been on this site since its conception and I don't think there is a installation how-to yet but if you asked I'm sure someone who installed it would post one.