Most concept cars from a SEMA stand quietly disappear. This one didn't. Unveiled at the 2009 SEMA Show in Las Vegas, the Shelby Turbo was a prototype, dealer-installed package developed with Turbonetics to wring 550 horsepower from the 4.6-liter V8 in 2005–2009 Mustang GTs. What set it apart from Shelby's existing supercharger kit was the goal of full 50-state and CARB emissions compliance, making it a rare attempt at a forced-induction Mustang …
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