8th Oct 12 Hi Clive, First off i dont own a diesel, however i do own a 1.4T which has one of the DTUK boxes on it since March, and it rocks!! The gains in the lower gears are substantial, but also very smooth, the way the boxes are set up allows for you to increase power over time if you wish. Abyss was very helpful after the initial supply and I will be going back to him shortly to see if i can have a some more ‘tweaks’ added to the box!! Order with confidence in that the back up and after sales is first rate and that the product does exactly what it says it will do! Have fun!!! Mark