If you want to run gearing for 60+ mph it's advisable. Keep using plastic till it breaks if you have no other use for it.
ps. 4S doesn't necessary mean less power, it's just lower voltage which will pull more amps to result in similar power output. As your battery/esc will restrict the max amp flow, there will be less peak power.
ps. 4S doesn't necessary mean less power, it's just lower voltage which will pull more amps to result in similar power output. As your battery/esc will restrict the max amp flow, there will be less peak power.