That's about right, stock were generally sealed can, "standardised" motors.
Mod were anything goes, dump the batteries 5 seconds after you finish your heat, rebuild/reskim weekly.
Basically.
Now we just have stock/blinky classes, where motor performance is essentially controlled by the ESC. (but you still have to have a standard motor and fixed timing endbell IIRC) and mod where you can either just turn the blinky off and go mad with your stock motor, or get a faster motor, no need for skims and rebuilds weekly.
If you are looking at the difference between mod and stock software on ESCs, AFAIK (and i've only looked at speed passion stuff), Mod software is designed for fast motors, so tends to have less adjustability, so you don't explode the motor, and stock has all the boost, turbo, timing and so on. So you can turn your "slow" motor into a rocket ship.
Think SP recommend a cut off at 8.5 turns.
FWIW, the 8.5 in my 410 gives away nothing noticeable on the straight (20+m long), but is far more driveable on the twisties than the 6.5 i had before.
The 5.5 i briefly put in was ferking insane, probably thanks to still having all the boost and timing turned up to 11 on my mentally unstable ESC........
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