I am not sure on how to apply the force to the lookVector of Car.Body.Body.FrontPart I am not sure if this is possible though.
elseif input.KeyCode == Enum.KeyCode.LeftShift then
BodyForce = Instance.new('BodyForce', Car.Body.Body.FrontPart)
BodyForce.Force = Vector3.new(Car.PrimaryPart.CFrame.lookVector*10000,0,0) --Not sure how I would set it up here.

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I wonder why this got accepted if what I said, which was basically the same thing you said, didn't work. https://gyazo.com/34be484e4e76b9290a60ffcf0d624440.png