Hello all, G15 M850i: With me the complete brake has to be made in front and back. Discs and coverings. Now the question arises for me whether I take the standard discs and coverings again or for approx. 220,- more like the M-Performance system?! The difference lies probably only in the discs. The M-Performance are perforated. The documents for the standard and the M-Performance are the same. Does anyone have experience here? Can anyone tell me something about pros and cons? t really dissatisfied with the standard brake, but 220, – is now not the world. Is the M performance much better? Is it louder? Etc., etc. Questions about questions…