No, balancing the motor will not take out the vibration which is inherent in an I4 motor. A boxer is two 2cyl motors combined, MMcV. I took them out of my starion motor and always regretted it. It buzzed me to death, fractured the ps pump bracket 3 times, turned the a/c bracket into about 8 pieces, turned the objects in the rear view mirror into a blur, and vibrated my big gulp out of the cup holder at least twice when empty. Keep the balance shafts and don't wind the motor to 6000 and change the belts at the required intervals.

Not responsible for advice not taken...