Bart, I was told by a tuner that also sells GM engine/transmission modules that you can use the factory modules for your application.
He sells the Trailblazer pair for under $180, though I am not sure about the LS3 module, if it takes a different one or not. It probably can use the same module, just a different tune.
I can hook you up if interested.
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How many of you have driven over 340? 
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