Exploding view of the torque combiner used in the Porsche Boxster conversion. The torque combiner was used to maximize usable space in the stock engine compartment by allowing two motors to be placed at the bottom of and one row of upright lithium batteries, in two columns on top. Would I do this design again? Perhaps not, but the alternative option for this conversion would have meant a complete redesign of the transaxle engineering which at the time, seemed to be a more daunting task. Two motors are definitely more bother than one, but there are pros and cons. The pros include more maximum power, better heat dissipation for the same power used, and lower internal resistance of the parallel drive systems.