So as a more relevant reply to the OP post. Adding another snorkle or openings to help the engine breath does add some performance IMO, but it may not be what you think. On my car, when I added 5 small filtered holes to help it breath, all it did was help the throttle response be a little quicker. Its very slight but noticeable. I also have an aftermarket exhaust which also help's the throttle response improve.