Would you run a 9005/9006 upgraded wiring harness if you get BMW lights?

 

No.. you get to custom make one to fit into your car.
either that or you spend $15 to buy sockets for a set of 9005/9006 bulbs, then you spend another $60 to upgrade that..

Or you could just spend an extra $25 to begin with and buy a box of relays and a roll of 12awg wire.
works just as well or better than APC's harness.