Joining the world premiere of the 2011 Cayenne-based Magnum at next month's Auto Zurich Car Show in Switzerland, will be yet another new tuning proposal from Porsche specialist TechArt, this time based on the Panamera sports saloon. Dubbed the GrandGT, the tuning firm's new customization program revamps the Panamera Turbo's exterior and interior styling, and performance.
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