I am new to this forum and was wondering if anyone could help. I have just taken delivery of a A4 1.9tdi Avant Sport and I want to chip it. Most importantly however I do not want it to affect the warranty. After some research I have been advised to go for one of the above. Has anyone had either one of the above done on their car? Which one is best? Which gives the most torque? Any information would be helpful. And finally is it definately a lot better on fuel consumption?