Hi, sorry I'm new here, still finding my feet on this forum, bit of a maze. Anyway, have 2008 E92 M3 stock 19 inch wheels, stock springs/shocks, want to add spacers not sure what to go for, or why I have to (?) go different front and back when the distance moved outward will be the same if i go same size F & R, the 'stagger' will remain the same? What difference would it make if I went 15mm f & R, or 15f 12r? I do not intend to lower. Please help.....thx
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