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Working in conjunction with GM Design, Gravana Tuning - a highly regarded supplier of aftermarket accessories - has pushed the Saturn Sky to the stratosphere with a highly customized concept. The Gravana Tuning Turbo Saturn Sky delivers even more of what roadster buyers want: all-around performance and "stop-dead-in-your-tracks" design. By adding a Hahn Racecraft 16G intercooled stage 3 turbocharger to the Sky's 2.4L Ecotec engine, the Gravana Tuning concept returns 348 horsepower and 341 lb.-ft. of...