TSM, AVC etc are a different type of gyro compared to a drift gyro. The "stability systems" like TSM and AVC are head holding gyros, basically they make correction to ensure they are traveling in the same direction. Drift gyros are rate holding gyros which means they won't try to make your car go straight they'll just try to maintain whatever orientation you put it in. Ie maintain a drift. If you put TSM or AVC on a drift car they could constantly try to pull you out of the drift while a drift gyro helps maintain the drift. Hope that helps answer your question.