I have the Zunsport grilles on my GTS however I haven't told my insurers. The ones you need to have on your side are your service guys and girls at your OPC.
Believe it or not, Porsche do not like folk adding the grilles as they claim they reduce airflow to the condensors/radiators and, as a result, may void your warranty however, Mine has been in for warranty work and nothing has ever been said. If you car needs to go in for work and you're a little concerned then you can always take them off.
I'd also suggest taking them off and cleaning the condensers of detritus in the spring.
Dan
Believe it or not, Porsche do not like folk adding the grilles as they claim they reduce airflow to the condensors/radiators and, as a result, may void your warranty however, Mine has been in for warranty work and nothing has ever been said. If you car needs to go in for work and you're a little concerned then you can always take them off.
I'd also suggest taking them off and cleaning the condensers of detritus in the spring.
Dan