Hi Loke,
I hope I can answer your Q for you.
When the engine is sold to the airline, the engine control unit is set to the rated power that airline requests, and pays for!
By 'slamming' the thrust levers to full quadrant on an NG, you will not get any more power, the electronics see to that.
It's an unfortunate result of all these electronic systems, in the 'good 'ol days' one could 'firewall' the thrust levers for short periods, with some resulting power benefit, in emergencies, with these systems, one must hit the ground or obsticle with serviceable engines!
Oh, and the highest thrust CFM engines available right now are the CFM56-7B3 or -7B27/A, all at 27,300 lbs @ SL/15C.
Hope this helps, Cheers
