To use coils that are significantly smaller than stock, you have to have an ignition that controls dwell very precisely. I think a Dyna 2000 or 3000 ignition does that. Then you can use the Dyna mini coils. But then, you have to find a place for the Dyna ignition box, so you won't really be saving much space overall. You can, of course, hide the box somewhere out of the way.
