Power engineering black chi silver ecu for s2. with black ecu. came off the car as a pair, ran well, couldn't see any markings on the chip in the black one. Power eng chip in the silver one as per pic. £50 the pair but please check the symbols are right for your engine, i haven't a clue.

s1 ecu. chip unknown. think its standard. ran fine 4 years ago. £20 delivered.