Thanks for the mention!
I can 99% guarantee the metallic films won't interfere with satellite radio, navigation or bluetooth, and I can say this because we've done a 2011 350Z with all of the above this year.
I have attached Llumar's Automotive Spec Sheet, as you can see the CTX (ceramic) series performs nearly the same as the metallic at rejecting solar heat... within 6%.
With that being said, the ceramic is a great product but I won't up-sell to anyone that doesn't actually need it. Take that extra money and put it into the Paint Protection!
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