The Signature gets all the goodies available for the Mazda 6 range and offers an exciting alternative to premium offerings from the US and Germany. The only distinguishing feature of the exterior is a Gunmetal colored front grille, but it's on the inside where the Signature truly shines. A frameless auto-dimming rearview mirror with HomeLink, Nappa leather-covered seats, Sen Wood door and dash inserts, and a black headliner set the tone and a navigation system, satellite radio and a surround-view camera system puts the final Signature on the check to the Mazda dealership.