Yeah, the CT4-R doesn't have an engine, servo, or radio system and you must build it yourself, so it is allot cheaper than the CT4-S and CT5.

You will need 20% nitro, igniter, 12AA batteries and some tools.

This is the information on the DSX radio that comes with the CT5: http://www.cenracing.com/downloads/dsx-manual.rar

Hope this helps.