Shouldn't the ARC-8 and EC-7 be the same in front? Same 18x8.5 size and ET45 is what is recommended for the front, I believe.
The recommended rear fitment is only 4mm offset different between the two as well. ET58 or ET62.
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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