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Twin dual exhausts belie the handwritten (in dirt) badging on this "S600 AMG," which is likely the upcoming M156 E63 in the flesh. The $130,000 super sedan, which will be out in mid-2006, will get MB's new, high-revving 6.3-liter V8 producing 510hp unaided by either compressors or turbos.

Spy Photos Of S-Class AMG [eMercedesBenz]

Related:
Spy Photos: New Mercedes AMG Models Get New 6.3-liter V8 [internal]