You shouldn't have an issue writing over the smarty tune. Who wrote your current tunes? If there are issues you should contact them for diag/retune.
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06 SCLB. Built 48re, ATS Twin cp3, s369sxe, Fass 220, Hamilton 188/220, 110# springs, DDP 220's, Big valve head, .40 over, 12v rods, balanced rotating assembly. etc..
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