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Call superchips. Thats where I got mine for my 97. I had a Hypertech on my 98 z28 and it scrambled my PCM twice. Thats why I went with superchips microtuner.
Vinci and Crane just developed an advanced programmer for the 97/98 C5.
It appears to contain many more features than the Hyper Tech version, such as timing advancement/adj, air/fuel adj in addition to the usual fan/temp, tranny shift point/line pressures and also features 2-3 cam and head programs as well. You can get more info at vincihiperformance.com or the Crane cams website.
If you end up buying this unit please post a short thread so the rest of us will have some feedback on how well this unit does/doesn`t work.