It does work on GD onwards aswell, but I'm not sure of the reset procedure or how to set the
ecu into it's "fast learn" ready mode on the later models.
I know it works on GC's because I could log the timing before & after using the Greddy scan tool I had (that Damo has now) and see the base timing come up by 3 -4 degrees across the board.
If someone knows the GD method feel free to post it up!
To quote MRT:
"NOTE: This is only applicable to MY93-00 (GCA) models.
The later model MY01 (GDA) onwards require the use of a product such as the DeltaDash or similar to reset the ECU. Please see
www.ecutek.com.au/delta-dash.htm for
more information."