And i should also say that you do make more power with the 1.3 ecu , but it will come at higher rpms.
The 1.6 with the 1.6 ecu has lots more power lower in rpm's and pulls smoother.
With the 1.3 ecu its slower until you hit 4000rpm , then you feel lots of power comming in
Yesterday i switched back from the 1.3 ecu to the 1.6 ecu and must say that i rather have some more power lower in rpms then at high rpm's.