Chip location in ECU

[Broken Byzan]

Hi, i only have a NA 1.8, but was curious that if i were to chip it, which chip do i replace?? I have an option of recieving a chip and socket, but having peeked into my ECU io see that there are 2 chips that meet the criteria . /ubbthreads/images/graemlins/confused.gif

Any help or comments please.

Unless i can run a used ECU perhaps, or will that upset my imobilisor??
/ubbthreads/images/graemlins/beerchug.gif

 

[Broken Byzan]

I forgot , its a 1998 A4 Se 1.8 NON turbo

Ta /ubbthreads/images/graemlins/blush.gif

 

[Broken Byzan]

i know its one of the top two square chips, which one?? If only it was already socketed,lol