Hitec 645mg better than sf-5?

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The Hitech HS-645mg has a slight edge on the HPI Racing SF-5, both have the same speed, but the hi-tech has 9oz more on torque.
 
You might if you are using a good 6V hump pack battery.

As for me, I noticed immediately my truck hold the turns better while making long sweeping turns, especially in the road and grass where the tires have lots of grip.

With the stock servo I had less and less turning radius as the speed increased.
 

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