Other key factors to consider are boost tubes and boots. The Banks system uses tubes that are free of sharp bends or compressed sections. By design they feature 33 percent more internal volume over the factory setup. This streamlined delivery route translates into quicker turbo spool-up and improved airflow to the intake manifold. It also helps free up restriction that the turbocharger would have to overcome. This adds efficiency to the engine. To better understand this effect, grab a straw and try to blow through it while gently pinching it shut. You will notice that your body has to work harder to push air past the pinch point. That's exactly what your turbo has to do to overcome boost tube restrictions.