Technically speaking, can I run 255/35 19" in front and 235/40 19" in the rear? If I recall correctly, that can damage the haldex systems but does not affect the torsen Quattro systems as in the B8. The front would be 26.0" tall and the rear 26.4" or so. I already run a 10mm wider front track with 5mm spacers on either side.