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Tearing our attention away from the GT supercar, we finally focused on an '08 Mustang GT/CS. Also trimmed out in black, the California Special was already strapped to the GMS Mustang chassis dyno. It was to be the subject vehicle for today's test of the Granatelli Motor Sports Pro Series Xtreme coil-pack kit for 4.6L Three-Valve engines. The only existing modification on the GT/CS was a Granatelli cold air kit.