I'm using my Samsung Galaxy S4 GT-I9505 with the cyanogenmod nightly build 11-20140830-NIGHTLY-jflte.
Works perfect except bluetooth and headset connection with my car.
Connection between S4 and a laptop (win7) works fine.
Car bluetooth is BMW E61 from 10/2006 without any modifications.
Symptoms: S4 and car find each other, PIN/Passphrase is transmitted correctly, car says c