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A look inside the supercharged Cadillac 4.4-liter Northstar V-8, unique to the 2006-’09 STS-V and XLR-VThe two V-series cars that followed — 2006 XLR-V roadster and the STS-V sedan — flew under the radar, yet beneath their edgy hoods lurked special V-8s designed for effortless power and torque.
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