I have a TL-S tinted with metallic tints and the Navi. Personally I have never had problems with my Navi acting up, but other TL people I know who had metallic tints did have trouble. The antenna is imbedded in the rear glass, and some members with metallic tints noticed interference from the metal with the anteanna.

Tints with no metallic content should work just fine, so just make sure to tell the installer.

Oh yeah the 03 TL-S with navi roof antenna is for the Onstar service, not the Navi, so I am not sure how compatible they are.