Yup.. it changes the whole sound system. From 6 speakers to 10.
In addition, here we get the 4,2 tft screen instead of the 3,5 matrix one(I don't really know if that's the case in GB).
I absolutely love your car. I'm quite sad that i didn't order the skirts but it was optional and it costed about 750 euros, so i delayed the purchase till next year. Hope you enjoy it.