[Moffster]

Hi, I'm new to the group and late to BMW ownership.
I have the M sport brembo brake upgrade and I've been looking into replacing my discs and pads, the brembo replacement discs and pads arent cheap obviously but I've also been looking at the possibility of fitting M3/M4 brake discs and I dont think theres much difference in price, I currently have the 340mm front and 345mm rear discs, I think the M3/M4 discs are 380mm and 370mm anyone done the same upgrade before?
Any help/info would be much appreciated, cheers