Excuse my ignorance here but what is it that makes the difference between the two car specifications when the engine sizes are the same, is it all in the electronics??

No, the higher power engine has an extra intake port per rotor to allow additional airflow at high revs, hense the higher rev range and greater power output.

Cheers
---Dave

Hi-power has 3 aur intakes instead of 2, coupled to an n-dias variable length multi whatsit air intake.

It also has a 3rd injector the low power doesnt have.

In short, dont even think about tweaking it - it would cost more than the 2k price difference!