Just fitted this to the rear of the head unit of a non Sat Nav Business CD Stereo with no DSP on my '08 E86. Works perfectly with iPhone. Awesome upgrade. It's a bit of a tight fit but goes in with some harness jiggling.
https://www.amazon.de/dp/B0773QRL6K?ref_=pe_27091401_487187591_302_E_DDE_dt_1
https://www.amazon.de/dp/B0773QRL6K?ref_=pe_27091401_487187591_302_E_DDE_dt_1