Add all the aluminum parts possible.
Plus add: bearings; ball diff; turbo; triple shock...
It's bound to add up to a hefty weight difference compared to the stock-Z.
It's academic, the density of aluminum & steel compared to polystyrene & nylon is a big difference on any scale. And it's logical to say that more weight means slower accelleration, but which parts improve lap times.
Glamour or performance? Sometimes you get both in one part.
It's kinda like Wedge's LEDs make him go faster.
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