blue red blue is a common s1 ecu, it wont matter either way what you have, i found a box with 15 rs ecu's in the yesterday,


some peopl3 say a series 1 is best ecu as it allowed 1psi more and had no knock sensor, i may be wrong but i think you have to disconnect the knock also otherwise it was im permenent knock/safe mode

i could be talking crap its been a very very long time sice i used kejetronic stuff