Any recipricating engine is just simply an air pump. Anytime you can decrease delta P (air) then you'll gain efficiency... that is as long as the motor is'nt creating it.
So *yes* you'll gain **something** at some point in the rpm scale. But you have to consider the total air volume and at what rpms it's taking place.
There is a reason why we up here in motown engineering shops.. don't supply cars with electric leaf blowers.
If you really want to improve performance as cheaply as is possible.. get a quality nitrous kit (like I have) and use a bit excessive octane to prevent detonation.
Rich