Hey Kev, if I were you I would try Chris Johnson Motorsports, he sends you 5 chips, one he thinks should be right on, one 2% rich, one 4% rich and also 2% lean and 4% lean. That way you can play with them and find which one is best for your setup and if you aren't happy with those he does 5 more and so on untill you are happy with it...
And yes they can be re-programed but that isn't cheap ethier...
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92GT all the free stuff and a few bolt-ons, lowered with Ebiach's and Koni's, Kenny Brown subframe connectors, lower G-brace and jacking rails. BBK upper and lower control arms, polyurethane bushings all around and Ken Bell blower, ram-air, 80mm mass air, etc.