Tony you are pretty correct in your thoughts about the 7501000. They would assemble them and if they ran very well they were 1000s if not they tuned them as 750s S
Exactly, but word of caution on the older RAM's (like year 2000 or so) - These had the manual start box and the ECU used case pressure to control the speed, not true RPM sensing like current turbines. Some people would take a 750 and use a 1000 ECU causing their own self destruction. There were even a couple scam artists trying to sell a used "1000" that was really a 750 with a 1000 ECU.
750 max CP of 1600 Mbar = 21.3 lbs of thrust (approx 120k RPM)
1000 max CP of 1900 Mbar = 28 lbs thrust
Sorry if I went off topic on older RAM info - just nice to remember times when people had to actually know what they were doing - not like today where the ECU does it all and people have no clue when something goes wrong & how to troubleshoot.