MSRP for an A8 is $58120 for base and $63120 for Z51. Both can be had for invoice or less.
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Bone-Stock on Stock Tires
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Rank~~ E.T.~~ Trap ~~~ 60'~~ Driver~~~~~ Details
1~~~~11.372~~119.94~~1.623~wfarmer.z~~~~'14 A6 Z51 (Post#275)...
Shelby didn't have anything to do with the design of the GT500. It's purely a marketing name/gimmick to attract people who find that sort of thing desirable.
This is not confirmed. Customers have been placing orders for multiple cars without the intent to purchase, and many dealerships have unsold allocations.