18th Nov 09 I have fitted a chip to my 4.2TD VX and it is outstanding, offering a much smoother refined engine with tremendous torque across the lower rev range. Provided you don’t play with the additional power, fuel economy has also improved I get 24mpg now even on short stop start trips. In short I cannot recommend this device enough. I did have to notify my insurance company and it cost me an additional £80 per year. Company I used were DTUK, cost fitted £391, bought in on a try before you buy and I certainly would not return it as it has made my VX into the car it should have been as it left the factory