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XLR-V and STS-V have a supercharged Northstar with a slightly reduced displacement down to 4.5L. The STS has a little more power because the pre-supercharger plumbing is a little better due to having more room to put it. Dan might know a little more about the stuff than I do though. But I really like the Supercharged 4V motor idea, the STS-V is a cool car, if someone was forcing me to buy a 4-door...
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