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BigAls87Z28 · 02-17-2009, 10:45 PM

The 426 is the official dyno. There is a lot of est. dyno numbers, but untill its certified, its just all rumors.
the ZR1 was said to have 620hp, it ended up with 638
The CTS-V said to have 550, it was cert. for 556.

02-17-2009, 10:45 PM	#4
BigAls87Z28 Join Date: Jul 2004 Location: West Long Branch Posts: 13,598 iTrader: (3)	The 426 is the official dyno. There is a lot of est. dyno numbers, but untill its certified, its just all rumors. the ZR1 was said to have 620hp, it ended up with 638 The CTS-V said to have 550, it was cert. for 556. __________________ 2/20/2013: They Day the ****s Stopped