well im installing on my buddy car a X4 for his microtech and i know that the plug with the gray wires goes to the ecu and the orange and yellow ones are for the coils, my question is the wich ones are leading and wich ones are trailing the orange ones or the yellow ones? are they setup like the injectors wires? thanks

eddie

 

Yellow=LEADING FRONT
Yellow/Black=LEADING REAR
Orange=TRAILING FRONT
Orange/Black=TRAILING REAR