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Does the 5spd have a stronger gearset then the 6spd?
With more power you probably don't require as many gears anyway.
I imagine the physical space available in the engine bay is the same, so 1 less gearset means wider teeth on the remainder.They say the 5 speed has less moving parts inside the box which makes them "stronger" but people still break them, if I drive like an idiot, I would probably break it too haha.