I like the slight differential between the front and back....so I think I will just poke all 4 out the same. I think 15 might be too much so that is why I am centering on the 12 all the way around. Not sure I would like 15 rear and 12 front......decisions decisions.....
I looked at the M3 at the dealer the other day and Bam! there is a big differential
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