>GM doesn't have 80% + of the auto market.

Ahhh, right. How about Trabant in East Germany? Wait, their chassis people did NOT talk to their engine people. Case closed. Wall down.

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>>Oh, now I see what you mean: Due to regulatory constraints the left hand is not supposed to know much about what the right hand is doing. That's plain silly, how can anyone run a big business like this. What about if the GM chassis designers weren't supposed to talk to GM engine designers? That would make for one silly and dangerous car.