I was told that if trinity/Novak/whoever makes a motor and they have it approved by roar with the 12.5mm tuning rotor then its legal . but let's say u have a trinity D3 21.5 and add a 12.5tq rotor (which wasn't ever approved by roar as a unit) or u buy a EA/fantom D3 based motor as a Tq tuned motor , no its not legal .