Box Rocket
SILVER Star
Considering that the "bird-feeder" type I'm using currently was for the OEM Toyota snorkel I believe the opening on the rear shouldn't be an issue. I can see a potential for a vacuum situation with a Safari type snorkel head turned to the rear. The bird-feeder doesn't rely on the rear opening as the only inlet. The bottom has a finned opening, similar to a fan to create a bit of a cyclonic flow of air into the head. From what I've read it's to help with separating/filtering of dust/dirt particles by spinning them to the outsides where they don't make their way into the main snorkel airflow.From Air-Flow snorkels of Aus
Important note: Do not turn the Air Ram away from the direction of travel because it will lessen the positive pressure necessary for proper operation. In extreme situation, at speed above 15mph (25km/h) a vacuum may be generated causing irreversible engine damage