Servo.

Servo at RC Shopper: 36 items in stock in the UK. Prices run from £9.49 to £218.49. Stock comes from Reve D, Power HD, Yokomo and 6 other brands. Fitment varies, so read the listing for the exact chassis and revision. This is all on the shelf, not on order from a distributor. Before 2pm on a working day means it ships that day. Servo speed is what makes a car feel like it responds to you. Torque only matters once the speed is there.