It's stupid that the boxster/cayman/911 don't come with grills straight from the factory. It solves a design flaw that's been around since the 9x6 series. I just don't get it, they could even make money from it and have them branded.
Only GT cars have the mesh front grills, you can get a GT car mesh to fit a GTS models but its a bit of work and requires changing a few clips over. The options from Zun Sport which I believe these are above are very good and could save a £1000+ bill if you are unlucky enough to have a stone go through the radiator. I was looking at these a while ago but they didn't have the centre grill which had a cut out for the ACC but I believe they now offer these in ACC and Non ACC fitments.
However, Porsche "can" fail the car for its 111-point check with these, come warranty renewal time but I guess this is depending on the OPC.
I believe this is down to cooling, as that what I have been told from one of the instructors at the PEC in Silverstone as if you notice GT cars have a lot larger intakes but also have a lot more power as well.