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I am also working on a 4wd offroad vehicle, but the bmw with the motor in the back i would just have adjustable coilovers to accomidate for the extra weight and i would build most of the battery pack under the car/under the seats since i would be elliminating the driveshaft and exhaust and motor/tranny completely, leaving the trunk space alone and using the under the hood for some batteries but mostly the controller and electronics, not much more weight than the original components, but with stiffer suspension
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