JCL, The rear pads are not really the issue. The front pads however use a "new" pad shape (d1294) which is not readily available. In addition I believe the pads are larger on the 4.8i since the rotors are also larger.I would prefer matching pads front and rear. I will look into the Extended duty pads with Dave. THX for the info.

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2013 BMW X6M-current
2013 Audi S4-current
2007 BMW X5 4.8i (E70)-sold