Bow that sir I don not know, but there is another way that you can get dual exhaust.
1. you can either get a one in two out muffler(such as a borla) and have a shop bend the pipes and such for you.
2. you can take the stocker off and gut the exhaust place a Y pipe adapter in the exhaust so that you have one inlet and two exits cut the whole for the other side and have the pipes bent(also you will want to stuff it full of insulation to cut down on some of the noise).
Neither the Evo or Ralliart have true dual exhaust the second option in a nut shell is basically what they have except with larger tips and pipping.
Hope that helped you out some.
http://www.borla.com/proxs/pages/muflrtrans.php