I have a Jan 2004 A4 1.8T Sport 190bhp. Can anyone help me with the following questions: 1. How do I find out if I have the full DIS installed. I believe all A4's have a limited DIS but you can have a full DIS as an optional extra when buying the car from new. Using my stalk I count 6 display options. 2. I am considering an AMD stage 1 upgrade. I have been told the following by AMD: "We have found that the air pipe connecting the air box to the turbo charger unit, collapses when the engine is tuned. This is down to the pipe being too soft. Under high speed, the air intake is so powerful that it has enough suction to suck in the pipe. The solution is renew this piece with a larger bore steel item, cost £180.00 + VAT. It is not absolutely essential but recommended for optimised results.". Has anyone any information on this and how essential it is to have? My car is still under warranty and AMD have told me dealers shouldn't be able to see the upgrade. However using a replacement steal pipe is slightly going to give the game away! 3. Does the Audi warranty become void if an upgrade such as AMD is performed? Or are they respected enough that Audi is ok with this type of upgrade? Many thanks.