First modification was to get rid of the big and ugly side mirrors.
I was able to find a pair of blue ones from a 2008 135i at a scrap yard.
Also bought a pair of carbon fibre covers.
And a set of nice carpets.
New side mirrors on the car and switched to stock summer wheels.
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Mods: Black kidneys & side markers, blackline rear lights, 2008 side mirrors, 19" VMR 701, remapped, 135i instrument cluster, X3 Steering wheel trim, Z4M gear knob