Yeah i`ve seen the scary tales of boxes going all hari-kari!! Am i right in thinking its an ar35 i need? Can this be donored from any 3L mig, or are their specifics?? Still after info on these plug-in units - can it really be THAT simple??
Having just chipped one myself here are the good points using the mentioned chip above.
Before - Fuel economy 25-30mpg around town, 45mpg on a long steady run
After - Fuel economy - 35-40mpg around town, 60mpg+ on a long steady run. Infact i managed just under 65mpg on a 200mile trip from cold over the weekend, but i was driving like a grandad.
Power is greatly increased especially low down. As far as i know the AR35 will simply plug and play, i think they have the same internals as the AR25 just better quality materials. If you go for the manual option then budget for a 3.0v6clutch.
The hardest part is finding someone who will fit it. The boards are pretty old fashioned and tough, but you still need a decent der-soldering station. I got a local computer repair to do it for 30 quid but it took a lot of ringing around before i could find somewhere.
Good luck