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My suggestion: unless you really don't care about money, forget about the CALB batteries. You can get crashed Leaf or Volt cells most places for much cheaper.

The AC50/51 is a good choice to duplicate what you had- peak torque is only 120 ft-lbs so you'll still need your transmission. If you really intend to drive your car, AC is great- power brakes basically for free, and a 10-15% range boost vs DC. If you just want a performance toy, a DC motor will give you more power and way more torque for the same money. You can also save even more money with DC by buying a kit to build a controller rather than a finished controller.

Otherwise, just read up on various threads here. I have no specific advice for a BMW- too expensive for my tastes.
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