Jst came accross this site http://www.chipexpress.com/ for diesel models only.. Apparently it improves your fuel consumption etc.. read a testamonial copied from the site below:
“Not very scieintific I know, but have just been to our office and back, mainly motorway, cruise control set... used where possible, journey down with the chip isolated, 68mph average, 46.2mpg at end of journey. Re-installed chip over lunch and return journey was 65mph average and 56.4mpg. Thats 10 miles more per gallon, or 20% less fuel!”
Do you know of anyone who has this installed? If yes, does it really work?