I think you don't get what all these different chassis layouts are about. It's not only the difference in weight distribution but also a difference in weight transfer. When the motor lays parallell to the rear axis (like in a B4 or 22) the inertia of the rotor generates some kind of artificial weight transfer when you accelerate or decelerate, which affects the handling massively. Even the difference beetween a mm3 and mm4 configuration is a night-and-day difference. But personally i don't see any future for mm4 and midmotor cars on low traction. The only reason that you can drive for example a x6 cubed on low bite is, that it has so much weight transfer to the rear, but at the same time it looses all his rear grip as soon as you break, so you can not drive clear lines and have to point-and-shoot
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