Alright I'm trying to get this Audi, I just got to pick it up, but when I got to down to where it is, the box with the ECM ECU CHIP it was flooded, and it's a 2001audi s4 stock, but I dried the chip out and replaced the oxygen relay, but it has a serious lack of power so I'm guessing it's the chi needs replacing, my question is can I put any stock ecu chip with the same serial number in it? Or can I put a different stage one in it.