Hi guys I've have my 2005 cayenne s for awhile now. Its a 4.5l na it has 140k on it runs great but I've been getting a whistle sound on cold start it seems to go away after the car warms up. Any idea what it could be? Then some time when I start it cold or hot don't seam to matter much it will make a winning sound its loud but breif. I think that is the starter failing but thought I would ask. Thanks.