Quote:
Originally Posted by ichiban
It is more dense which reduces heat in the cabin up to 10-15%, and ceramic does not interfere with radio waves or your GPS signal.
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Well the GPS antenna is on the roof but same concept IE radar detectors, cell phones, etc. Here is a good technical PDF that includes heat blocking etc. I have the ceramic 30 product. I am sure other brands have similar specs:
http://www.huperoptikusa.com/pdf_doc...DUCT_RECAP.pdf