There may be issues that are causing that dip with the ECU or the way it is able to be tuned etc etc....
With a power fc it would be easy to remove that dip.
Its not really fair to go blaming the tuner and give them a bad wrap for something thats probly not even his fault.
Yes it is running pretty rich at 5,500 rpm and he would never blow that engine up. but there could be issues that are causing this that the tuner had to compensate for.
anyone got any other afr graphs for remapped rb20 computers?