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    RS powertrain upgrade

    So what is it with GM/Chevrolet, not puting a different engine in the RS? According to info I got all they're doing is tweeking the trans. ratio to upgrade the powertrain. I initally wondered why they didn turbo-charge the 1.8 for the LTZ or new RS, but now Buick has a turbocharged 2.0 for their...
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