The upgrade kits are no longer available. To upgrade your engine you would need a R2LC radio board, Railsound power board and Railsound board. If your local LHS does not have what you need, we have it in stock.
691-R2LC-C07 Radio board
List Price $40.00 our price $32.00
691-RSPR-A00 Universal Power Board
List Price $40.00 our price $32.00
691-PCB1-0AD Generic C-420 RS4 Board
List Price $45.00 our Price $36.00
Bill