I'm in need of new tyres after 13,000 miles (Pirelli's - say no more) and the tyre suppliers/fitters are telling me I need to replace all four as it is a Quattro and will confuse the TPM system if I replace just the fronts. Is this right? Got a price fully fitted for 4 of just over £800 for Pirelli P Zero XL's which doesn't seem at all bad I reckon. Kwik Fit wanted over £700 for 2 Dunlops and £510 for Pirelli's! The place I'm using has also offered to rotate fronts to back after 6 months to even out the wear on the new set.