It would have been nice, if they also did the shotgun setup in carbon. Always bitching...... The double cans make more peak HP than the singles, at least on the RVF version. A little more pricey, but hey, you are getting the best possible outcome. Just having the single option is still a great thing. Paul and Matt are super nice guys and their stuff is top shelf. The welding on their pipes is very good. I recommend buying direct from them in Thailand. The shipping is pricier, but ordering it through their person here in the US takes forever, and it isn't that much cheaper in shipping. Just went to their website and it's not listed, might have to email them and ask. They are quick to reply.