I am going to say 11.9 to 12.0. 300lbs is significant. Look at 2012 GT500 vs 2012 Boss 302. 550hp vs 450hp similar times.
the car will have a bit friendly torque crurve and revs high.
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shopping for 2017+1le or zl1
2009 CTS-V -sold
2015 Hellcat-sold
2013 ZL1 -sold
2007 Z06- sold
2014 Chrysler 300
2011 Duramax 8" lift, deleted tuned
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