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From what I read there is no speed limit in the ECM
here are the mechanical limits
C6 LS3 206 5th gear
C6 Z06 227 5th gear
C6 Zr1 224 6th gear (.67)
Chevy advertised them all drag limited
192
198
205
the LS2's were 186. Now that being said most have not take the cars that fast and the chevy ECM's do have a place for speed limiters.
As for people saying a C6 is slow they are dreaming I ran times in my 08 in the quarter mile that rival anything the ZL1 has done to date but nothing faster than the 12.02 that that one guy posted in. the ZL1 ironically produces better road holding that my Z51 was advertised at.
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2016 2SS
2020 super duty on 37's
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