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SPI Twin-Turbo System

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    Tuner creates 1000-horsepower Porsche 911... with bolt-ons.
    1231551120

    Click above for a high-res gallery of the SPI Sledgehammer
    Most stock components in a production car can only be pushed so far. Keep adding horsepower and torque, and eventually...well, something is going to break. Some people, however, are all about exploring the limits. Take Tym Switzer, for ...

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