FourTrak Engine Control Unit rechipping


Has anybody had any experience with re-chipping the ECU on a FourTrak? I have read reports of products that significantly improve engine performance and reduce mpg, but there is little info on the manufacturers' web sites. For info I have a'98 Independent.

ECU???????????????????? Since

ECU???????????????????? Since when did they have those????????
Its all mechanically controlled AFAIK...