Not for the mute unless you want to design some new parts to mount one. The 55t spur and the 12t cb will probobly be your better option. It was designed similar to a buggy for racing. If you do not have the above mentioned then contact HCR for the part #. It's sold in a kit, spur, standoffs and diff brace.
If you want to work on mods to the chassis to make an Ofna 2 speed to fit then send me a pm.
Here is a Two speed in my friends GS Storm. It's an ofna 2-speed. I can't remember from what touring car it was though. I'll ask next time I see him on-line.