I've already started hoarding some upgrades like ball bearings, metal outdrives and dog bones.
I was wondering though - is there a ball diff for it like the SRB?
Also, its not clear but is there an underguard included in the re-re kit? I haven't opened it yet - I want to wait until I have everything and I'm ready to build it

I was also looking at doing the Supershot shock conversion - what parts do I need and where can I get them? I saw a 'pressed parts bag' on ebay which looked like it might be what I need. Does Tower sell them?
Finally - is there anything that is a 'must do' replacement / upgrade if I want to run it with a brushless motor other than the stuff above?