I recently had Saab install the Ipod input in my armrest console. It is nice, even though it lacks the ability to control the thing, but it is way better than the Itrip. BUT there is a lot of engine noise, when I switch to AUX even when the thing is not plugged in. (The Turbo kicking in makes this high-pitched noise.) Are other people having this problem or did my dealer just screw up the installation?