I recently found out that my dealer installs the K40 Calibre system. Any experience out there with this one. Any installation issues to be concerned about. Their brochure states that since no holes are cut through firewall, etc., that it will not void the manufacturs (Porsche) warranty. Does that mean that an SR7 installation (which would be done by a local audio shop) could void my warranty since the installer would have to wire it through the firewall?