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Do yourself a favor spend alittle money and go with a UTEC, you won't regret it.. If you go with a reflash you will have to retune if you decide to add anyother modifications.. All I did was change my single 3" exhaust to a single that was a couple mm's larger and it threw the tune off. Go with UTEC.
Honestly I haven't seen the Greddy twins untuned... With the power numbers everyone is estimating I don't think low 12's are possible. I don't know, maybe with slicks and a 1.8 60ft you might see 12.5.. Don't quote me though that's just a guess.. I'm sure someone will chime in here with better knowlage of this setup's capabilities..