These guys:
http://www.z-industries.com/
Were big in the early days of ZR1 modding.
I've seen quite a few of their chips over the years.
Not sure what all they offered besides the removal of the skipshift and better cooling.
I may be wrong, but I seem to remember they were in cahoots with TeamZR1 (also located here in Cali)
http://teamzr1.com/
Give 'em a call, I'm sure they will know what it was and what they did.
'Crabs