Hi Graham,
I'm from East Auckland. The black three-door Sedici I wanted to buy off TradeMe is also in Wellington, although I went to a Fiat Twin-Cam forum and a knowledgeable soul had this to say about the difference between the Mk1 and Mk2 models:
"Some will argue the toss, but the differences between mk 1 and mk 2 Tipo is the original pre 92 models had in the region of 155bhp. This was about 50 cars to the UK. Dont know anywhere else though., 92-93 models ran a different ECU.
Official 0-60 time was 7.7secs [92 onwards]. Mk 1 one had better cams then mk 2 which gave more power[145bhp] against mk 2 142bhp. Mk 2 had slightly more torque but engine feels flat. Gearing also different on two models. Best ive seen for mk 2, 0-60 is 8.4, and that was after a rolling road session. Its funny how many owners have fitted MK 1 cams and ECU to their MK 2's to improve the performance!!"