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The 2011 3.9L 9C1 Police Package was able to hit 139 MPH on E85 138 MPH on 87 Octane so I would guess about 130ish for the 3.5L.
 

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Oh I don't know. The SS only had a 4 speed auto, right? That means not as great of a top speed compared to the 6-Speed.
 

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I mean that some cars are "Redline limited" when it comes to top speed, and not governed. I'm pretty sure the SS was redline limited, meaning it ran out of top gear to keep it going faster with a 4-Speed Auto.
 

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156 MPH Top Speed for the 06 SS. 5.3L Ungoverned.

2006 Chevrolet Impala SS - Road Test - Car Reviews - Car and Driver

From Car and Driver:

Despite the antics of the overwhelmed tires, hard acceleration still leaves the driver giddy - at least for the first few runs. We certainly can't argue with this kind of performance from a family sedan that starts at $26,990 - there's that 0-to-60 time of 5.6 seconds, the quarter-mile turns in 14.2 seconds at 101 mph, and the ungoverned top speed is 154 mph. Much to our surprise, the SS turned out to be 0.1 second faster from 0 to 60 and in the quarter-mile than the identically powered but 132-pounds-lighter Grand Prix GXP we tested last fall.
 
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