Define "side draughts" as you understand them to be.
Any method of providing a greater volume of fuel /air mixture to the cylinders, in the correct ratio, will result in increased performance.

Induction systems with a horizontal airflow manage to do away with right angle bends which are seen by many as an impediment to the airflow at high engine speeds, so as long as any side draught induction that you may use is correctly sized to your engines airflow requirements, & correctly callibrated for mixture control, then you will gain an improvement in maximum engine output.