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I didn't take a measurement, was more a matter of matching the duct opening on the passenger side, which is fixed so presumably correct. Once I was happy with the orientation and position of the duct opening it was just a matter of drilling & mounting...
Free hand works pretty well if your brain lets you picture things like that. If not, I can get the bumper off this weekend, takes but a second, and grab pics & measurements of everything.
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1and1
135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla
. . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's
X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg
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