Slowing down a stock setup (titans in series??)

[MetalMan]

The EVX runs its motors in parallel on the circuit board. You could remove two of the motor wires. What I did on mine is take 12ga. wire and split the ends to go into both wire holes on the circuit board, since 12ga. is too large in diameter to fit into one 14ga. wire hole. (I hope this makes sense)
Then from the two 12ga. wires, you could have each one go to each motor, then put a wire between the motors to connect them in series.