Or a single 6s. If you would like to keep your muffler on the helichopter for the looks I can do this. price includes custom made pinion gear and rc motor mount with a 800kv motor with a modified shaft.Also a black base under the skids to hold esc and modified front end to hold 2x3s lipos.Lipos not included.This set up will give a 1800 head speed with supplied motor using 2x3s lipos.