Servo.

Servo at RC Shopper: 36 products listed, shipped from the UK. Prices run from £9.99 to £218.49. Stock comes from Power HD, Reve D, Yokomo and 6 other brands. Fitment varies, so read the listing for the exact chassis and revision. What is in stock is on the shelf, not on order from a distributor. Servo speed is what makes a car feel like it responds to you. Torque only matters once the speed is there.