This is the TAMIYA DT-02 chassis' most important and very first upgrade parts. I use a 4600 MAh battery pack for my DT-02 buggy with stock motor for bashing. After playing halfway, my motor is hot that nearly burns my finger and the performance has decreased. Once I installed this Tamiya (#53831) DT-02 Aluminium Motor Heat Sink, my motor temperature is under control after bashing halfway. My motor performance is steady throughout a battery pack and finally increased run time (fun time). This Tamiya (#53831) DT-02 Aluminium Motor Heat Sink is a MUST upgrade for TAMIYA DT-02 chassis.