Formula One Pinnacle tint is actually ceramic, not metallic. It will work with the Nav system and also not interfere with your AM reception ( antenna is in the back window ). I put this tint on my 2004 GS and it has worked just as it is supposed to - no interference. The Pinnacle tint is reasonable, but more than the Formual One metallic tint. One scenario is to have your back window done with the Pinnacle tint and the side windows done with the metallic tint to save some coin. Actually that is what I ended up doing and it blends and works well.

 

Well..this topic has been beaten to death...