VIDEO: Hennessey Performance Takes 2014 Blown Sierra Out For A Spin

VIDEO: Hennessey Performance Takes 2014 Blown Sierra Out For A Spin

Take one stock 2014 Sierra, add the expert knowledge from Hennessey Performance, plus a 2.9L blower, and what do you get? More horsepower than you can shake a stick at. See the wild video (with drag race) here.

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