Stock spec only means there is a rotor inside that fits in spec class rules. Touring cars for example mainly use 13.5 stock spec but you boost them with ESC settings if allowed or blinky if not. I use a reedy 13.5 with an Orca VX3 set to full turbo timing and 50%ish boost on a small track and the motor only just gets warm, any more is undriveable (I could run it slower and probably lap quicker but I like it fast on the straight!!)
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