That's the new Flex Deck. Designed for maximum ability to tune flex. Bolt it down tight and the car is very stiff. Loosen or remove any one or a multiple of the bolts and you increase flex. Depending on which ones, you put the flex where you want it in the car.
Yes, you can do that with any top deck. But on the Flex Deck, engineered for the purpose, each bolt has a big effect. You can tell the difference easily on the track for all the various bolts.
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