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I have a Z3, but I can really appreciate the clever design of the MIata. The "Power Plant Frame" is a strong but very light (either 8 or 12 lbs) aluminum ladder brace that connects the transmission to the differential. It eliminates putting the torque loads through the body, and transfers most of the thrust lift the whole way forward to the engine mounts.
It also enables a simpler one-piece drive shaft that puts the sliding splines at the transmission connection.
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