It does not matter what ecu you have , piggy back or stand alone, you will not get any more than what we quote on our web site, unless you are using higher than 98 octane fuel and can use more ignition advance.
For the compressor models, the MOTEC, Gems, FCON or similar will work better than E-manage or Unichip because the latter can only work within the car's standard sensor range. Having said that the latter is just about able to cope at the stage 1 level.
Hope this helps
Mark :)