correct, negligible w/ the caveat... depends on total surface area of weave. If you live in a very warm climate, you'll want to stick w/ something fairly open... say at least 85-90% open to minimize any negative impact on cooling. Particularly if your driving doesn't provide sufficient airflow - i.e. urban / much stop & go. In a cooler climate you could go w/ a tighter weave but in total I'd be hesitant going w/ anything that could block more than 30-35% of the opening (unless you live in AK...).

Good luck

 

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Wouldn't the limiting factor be the amount of air the radiators are capable of passing? The area fraction of the radiator openings has to be quite a bit less than the openings in the bumper.

 

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I just ordered the front set, 3 grills, for my '10 997 C4S in black directly from Zunsport. Ended up at $332.39 delivered using the discount code they provided for 15% off after I emailed them about their product. I will post pictures of the install when I receive them, but expect it to be as others have described with not having to remove the front bumper. I had to replace a AC condenser on another car that had the condenser in the open like the 997 and it was $1,100. So for me this is a no brainer.