Hi, I've got a 2010 535i with Hifi sound and am replacing the speakers and amp. I've read that replacing the rear parcel shelf speakers with non-oem can cause interference with reception for the navigation system. Is this true? I'd like to go with a 5.25" 2 way focal. While I know that it's a 4" right now, there appears to be room for a 5.25"

However, what I do not know is if I'm going to run into reception issues with the navigation system. Anyone swap out the rears without issue? Which speakers did you use?

Anyone gone through this and found certain speakers do affect reception? Thanks for the advice, appreciated.