It has transformed my C220 which has the older the older engine giving lots more low down shove and increased torque all through the rev range. I was rather bored with the car before I had a Tunit - now it is rather fun to let it rip from time to time. It astonishes other drivers on motorways with its rapid acceleration.
Tony ,Mitsubishi L200 animal
Immediately saw a fuel efficiency increase of 4mpg. I have not changed way I drive and now I have much more acceleration under my right foot - comes in handy. I now will not be selling my vehicle for another year as its like having a new truck!