For what I have seen, this is the only car with a much smaller right mirror, the all the other versions of the Leon (except CUPRA R), have both mirrors of the same size.
I suppose that its for aerodynamically reasons. As for Volkswagen, I haven't seen this strange right mirror difference, but I have sped the Cupra up to 210Km/hr (130miles/hr), and the car just sticks to the ground, giving you a very steady feeling. Perhaps one of the points I wanted on this car was the sunroof, but this option isn’t available on CUPRA R version.
I have a small mpg file of my brothers leon really burning tire, if you’re