You know what!?! Raask (sp?) has pipes that fit the R3T. I got these a couple of months back, I believe that they are all chromed, this was just a prototype. If you are interested, PM me, and I will see if I can track down the contact info. No Cat. Converter. Here are a couple of pictures.
They have that last picture up on their website, so they must be getting close to having them on the market. Their US distributor doesn't seem to carry the exhaust for the Rocket but I suspect they could order them when available.
An email from D&D (which I unfortunately deleted) said they're working on them, and evidently Jardine is doing the same. It looks like we should have a few options soon.