rcnats.... Ralph usually installs his ignition inside a cup shaped mount on the rear, but I wanted to make sure you know, that this is not necessary. I have had Ralph setup a couple of engines for me with separately mounted ignition modules. If you are comfy doing your own work, CHignitions can also help you out. Ralph takes things further for you though, machining off unused case bosses, etc. His work is really nice and oh, by the way, his work is warrantied for life. At least give him a call and talk about it...