i´ve got a 2 litre mondeo mk III myself and quite happy with it!
The Duratec HE is really a Mazda engine and even the engine mounts are quite different. I would suggest a st220 engine for more power but that means more front end weight. There´s some tuning companies in UK that deliver Duratec 20 HE engines up to 250 BHP. I´ve heard that up to 230 bhp is safe with the 2.0 and easily tunable up to around 200bhp with just othe types of induction systems. Very fun car though! But then again, nothing´s impossible, but is it feasible?!

Christian / sweden