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Either will be reliable... the roots will have more torq down low and might be more fun depending on your driving stye. It will be a little quieter too, but both will be a good power option for the entry level stuff. We wind the little 1.9L roots blower out on the CTS Vs to 17psi or so making close to 700whp reliably on the stock bottom end, which is similar to the new LT1 composition. I'll have some blower packages in the sale either way!
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