The question is if the vent will vent the air which if there is positive pressure (as I have been stating the entire time) than how in the world is the air going to do a 180 degree turn when the air on the top of the car is (in laymans terms) pushing down as well and thus when the air runs over and past the hole it will effectively PULL air OUT instead of pulling air in (that is with me assuming that the aero on the SLC was designed to still have the air attached to the car going when running down the back). I could understand IF the engine bay was NOT pulling air IN and was full of NEGATIVE pressure or at least opposite to the air flowing on top of the skin. Simple IE: if air is moving firewall to tail / ports and air is moving on the same direction on the skin of the car how aerodynamically speaking does the air pull a 180 turn in such a short space? Wouldn't that really cause a lean situation? I'm sure some time on tuning and it could be overcome BUT that doesn't mean that the situation doesn't exist or isn't happening again unless I have seriously misunderstood everything you guys are saying and that pic proved.