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Our read

GarageScout Take

The G-power SK2 conversion is the defining fact here, backed by headers, an Akrapovič titanium exhaust, upgraded clutch, Brembo brakes, KW coilovers, and carbon-fiber bodywork. Silverstone II is uncommon among observed E63 M6 examples, while the mileage sits above the middle for the generation. The extent of the modifications brings emissions approval into question in some states, with a cracked front lip, sun-damaged dashboard, and driver's-seat wear also disclosed.

Strengths

  • Second-owner example since 2011, with approximately 12,000 miles added by the current seller.
  • No accidents or mileage discrepancies are reported on the attached Carfax history report.
  • Factory carbon fiber roof panel and full Merino leather are listed on the build sheet.
  • Service documentation is provided, including records through July 2025.

Watch For

  • The G-power supercharger, aftermarket headers, exhaust, clutch, wheels, brakes, coilovers, and carbon-fiber bodywork represent extensive modifications.
  • The seller notes that the modifications may prevent emissions approval in some states.
  • Known flaws include front-end chips, a cracked front lip, sun-damaged dashboard, and wear on the driver’s seat.