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i'd done some research into this previously with the intent to use oem parts on the car. oem would be cool, especially because the part that blocks the airflow out the bottom is also part of the fender liner, so I was hoping that one part would (a) direct the flow into the wheel well, and (b) block flow out the bottom of the bumper cover negating the need for all those flaps that tear-off every 15 seconds).
as noted, the 996 GT2 and TT both have vented fender liners (as does the 997). the problem is, I don't *think* they work on the 986/996 because they are wide-bodied cars so the front end is different (unlike the 986 and narrow-bodied 996 compatibility). at one point I thought that i'd found some GT3 part #s that worked, but I think I was wrong. easiest (and cheapest) is to do what the gt3 guys (and jfro) did - drill some holes. given that the fender liners are a relatively soft plastic, you could most likely press vents into them to get some directional flow if you so desired.
as far as the centre vent goes, i'm going to check to see if I can get it to vent into the wheel well as well - there is a channel that the coolant pipes run in that would allow air to pass from the back of the third rad direct onto the brake rotors with a few artfully placed openings - you would just need to make it follow that path by blocking the front bumper cover bottom openings.
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