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Well if you look at the placement the vent sets in a low pressure transition angle area from where the stock entrance is located on the face of the front bumper cover which is a high presure area. If you were to make a hole above the high pressure zone into a low pressure zone the air that should have gone thru the intercooler will escape out the low pressure zone. The best is to keep the nose panel stock IMO. Unless it's a Lindsey racing stage five panel with the stage five intercooler that has a raised scoop on the penal to maintain high pressure (again IMO looks strange if not on a race car).
Like to add that a good spot to make a "VENT" would be after the intercooler which would be the front of the hood. That would keep the heat from the intercooler out of the engine bay and help the air get pulled thru the intercooler as well.
None of them. The factory intercooler duct in very efficient and well placed. Echo Humbo, adding a vent on the backside of the intercooler would be more effective, something like the 968 Turbo RS cars.
vented panels do look cool but are functionally useless as noted above.
if you wanted a ram air for intake/IC put it on the "vertical" plane of the bumper below the nose panel.
"unterdreckebereich" is low pressure.
Other than being classified as a vanity, does anyone have any actual data of a vented panel degrading the flow to the IC?
On a street car while running a Vitesse Stg.ll, as far as I can tell, there doesn't seem to be any noticeable difference in performance. On a dedicated track machine with more extreme mods, given the lower pressure zone, I can see how there could be evidence to back it up as a compromise or performance downgrade.
Aside from upgrading the 944 rear hatch spoiler, mirrors, and door handles, to the 968 trim, a nicely vented nose panel can be one of the best factory looking modifications matching the architecture of the 944 turbo that can be done.
Last week I just reinstalled my GT Racing nose panel. Over the years it has been prepped and painted a few times. The more paint the better it looks. It looks OEM to the average or better eye. Just be aware that the GT panel as shipped is somewhat rough and requires work to look decent.
This one after a fair amount of prep has approx. 6-8 applications of paint. Overall I'm happy with the appearance and it offers a bit more of an aggressive look. Sometimes I switch back to the factory panel, but always end up preferring the GT panel. It matches the two scoops below it in the nose perfectly.