New to the forum but have owned many Bimmers in the past. Question is, I have a 325Ci and I'm getting a 3 stage manifold from a 330i or 530i to gain more HP. What I need to know is do I get a 330i ECU and have that flashed or can the one I have now be flashed correctly for the 3 stage manifold. I have read alot about the conversion but not found much about the ECU. Also I know that the ECU's are coded to the VIN so how do I get round this if I have to use the 330i ECU.