Twin motor M02l

going to build me a twin engined m02l vw beetle

got a 20 turn HPI saturn motor with 21tooth pinion which is fast, but i want more

already built the front wheel drive gearbox and tried it with stock motors, MSC and un matched pinions. I had wired them in series which is no good

waiting for another 21tooth pinion and 20 turn motor and then will use ESC in parallel for some speed

UPDATE got pinion today, handling is better because of four wheel drive but speed is less than single gearbox