I've set a filter in Contacts so only contacts with a phonenumber are shown. When syncing my phone with the car handsfree set, ALL contacts are synced, including people who have *mailed* me once. Normal operation (with other phones, like HTC Hero and Sony XPeria P) is that when syncing the contacts with bluetooth via the PBAP profile, the filters are taken into account. So only contacts with phonenumbers are synced. This makes sense: only contacts that you would want to call when using the phone itself are the same contacts that only should be available in the car handsfreeset.