RS
ECU is essentially the same as Early GC8 (94-96). You can reflash them with VERSO.
Other options are:
VOS chip - Upgraded ROM chip that slots into the spare socket inside the
ECU. Has much better Maps and more boost.
Power FC - Best bang for buck Aftermarket
ECU for RS Liberty. theres one for sale ATM on the RSLC forums.
www.rslibertyclub.org