Originally Posted by
Airflow
You can see that YearRacing even call their 21.5T motors modified. Not sure to put too much emphasis on that
Well, in TC a motor 11.5T and higher is stock and 10.5T and lower are modified.
Maybe the stock/superstock/modified term is only a class term (TC, 1/10 buggy etc.) with some requirements on the turn number (21.5T, 17.5T, 13.5T and mod e.g. 4.5T) and some manufactures label their motors stock/modified to identify a relationship to these classes.