Are you really running enough HP to really need a C-6? Pulling numbers from the back of my head, I think that the C-6 robs 20-30 more horsepower compared to a C-4. Heck, I would even go for an AOD before a C-6.
I am running a C-4 with a transgo shift kit and a good rebuild kit behind a 400 HP 351W an I get tire chirping shifts.
Greg
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