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Just to give ya a comparison. I went 12.67 with what you have minus the ported tb and I had the vararam intake. After the headers and catback I went 12.420, though I know it had 12.3s in it. I think a 12.6 is in your future the way it sits. Good luck man.
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1999 MBM T/A - the new ride 
2004 CE Corvette - 1.410 - 10.246 @ 133.39
2003 Silverado - Lifted 6 on 35s
2000 T/A WS6 - 11.190 @ 119.79...SOLD
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