This would be for use on 4-stroke engines, They use these on real cars and signifigantly increase power, so here it goes:

I hope you know how a 4 stroke engines works and differs from a 2 stroke, otherwise you will be really confused.

When the intake valve on a 4 stroke closes, air piles up behind it because it slamms shut all at once, then the air bounces off and travels back through the carb and wherever it came from. If you could attach something that timed it so that the air bounced off, and then bounced back off something again, and then came back right as the valve opened back up the second time, it would force more air into the chamber, effectivly supercharging the engine.

I'm not sure if this could be done or not, but it works on real cars, and signifigantly increases power.