With a poor slipper setup I can see the pin mod causing more stress on the drivetrain, and it would not perform as well in stiuatiosn where you want more power on the rear than the front since it creates what I think is a 50/50 bias but I'm not sure what the actual percentages are. Even in that case, you may be better off running the pin, then changing the pulley's to get more rear bias.