I think how it goes in order...
GTiR box, made from twigs
WRX box, made from padelpop sticks
Familia box, made from used matchsticks
They full on suck, the cheap fix is dog a few of the gears.
Anyway, the engines are tough as nails, and are about twice the engine of the GTX familias, the turbo is about twice the size etc. Just yeah, that damn gearbox
But yes, anyway. I think the mclaren F1 GTR wins. Sorry. No skyline can compeat.