7th Oct 11 Hello Andy, Just to let you know that the box was fitted last week and I immediately felt the difference with near 50mpg economy (as opposed to 42ish) and smoother power delivery with more oomph. I have played with the different maps and boosts and have settled on map 3, 20% boost which has given me amazing results when towing the caravan. I have just been to Somerset and back (about 120 miles each way on A class single/dual carriageways) and I obtained 32mpg there and 34-5 returning as opposed to 26ish previously. The power comes in lower down the rev range and enables me to change gear sooner. 4th gear is particularly good now with lots of torque. My only comments would be that having to dismantle the box each time to change settings is a bit fiddly and it is easy to lose either the plastic items that change the settings or, in my case, the clear plastic section over the LEDs that fell down into the engine bay when I first dismantled it! However, I can put up with that given the transformation. Many thanks. Something at last that Does what it says on the tin!! Regards, Ian.