My soon to be father in law just got a silver C6 A4. Stock with a corsca exhaust and 3.12 gears or whatever they are (factory upgrade). He is not into racing that much (even though he does sometimes) but he loves being pushed back into his seat and wants some mods but does not want to void the warrenty.
I told him I THINK he could get away with a procharger and that would give him Z06 power but not kill the driveability and 3.73's and he is very interested in those. So far the only company I have found to sell themn is Thunder Racing but they sell them with the entire rear end unit and he does not need that.
Anyone know who sells 3.73's for C6's? I assume it would not void the warrenty.