I've got a 2015 CX-9 that has the bose emblem on the door panels so I guess it has the bose amp in it. I wanna put a pioneer 3800nex and a maestro rr in. I got necessary harnesses for both. I was told they were all I needed to do the install but crutchfield says it won't be compatible. Everywhere I look to keep the clock functions or change the lcd display I need the pac rp4. And the axxss harness for the backup cam. I'm wondering if anyone has seen the differences in functions without the pac because I don't wanna get it if I don't need it.