To be honest with nitro obviously being the most common power used in 1/8 rallycross, the electric is probably something they will either release at a much later date when the electric scene kicks off (if it does) with more big events and of course more electric racers wanting to race.
You never know though, they might release it soon, they've probably already got designs stored for an electric conversion but I think they will want to concentrate on the nitro version first. It might be the usual case of buy the car and go third party for your electric conversion parts.
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