I have just had revo st1 installed on my 2. TFSI (A4 B7) with settings b9t0. The difference is enormous but I think that something is wrong. At about 2500-2700rpm I hear the engine making a litle confused noise when accelerating with 3rd, 4th, 5th and 6th gear. I don't see any problem at the boost pressure; I checked it with VAGCOM. Do you have any suggestions? Perhaps the boost setting should be lower at 7-8?