The '99 Vette will require Tunercat OBDII and an OBDII definiton file. In '98 when I purchased my copy of OBDII tuner I want to say it was $200. When I last purchased an OBDII definition they were $100. I do not believe TC OBDII can be purchased these days without buying the dealer license or the Moates RR which puts you up to the $600 mark, then the TC software plus one definition is $225.
Also, TC sells Datacat, which appears to be a replacement for Datamaster.
http://www.tunercat.com/DataCat/datacat.html
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