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hi everybody,just joined this site and looking at the info you guys know is brain bafflin,why aint you all workin for audi and cashin on there richness i hope you can help me out with this small tobe(not)problem.i have a 2002 c5 rs6,if i put 275/35/19 on the back and 255/35/19 on the front will the car detect the wider tyres and go into limp mode

You need to post this in the RS6 Forum, not the VAG-COM Forum.

Your tyres have different rolling circumferences so you will be winding up your centre Torsen diff - which isn't a good idea!