I have a question about WBX AFMs.

  How different are the 1.9 and 2.1 AFMs? There are physical differences - throat size is different, and the attachment diameter is different for the boot. How different are the electronic signal outputs? Can a 2.1 item be used on a 1.9, without causing the ECU fatal and/or uncorrectable confusion?

  I saw a 1.9 fitted with a 2.1, and wondered if that could work PROPERLY....

  Thanks