AJN334

I am curious if PCM 3 units from a carerra or boxster will fit a 955 cayenne, also how close to plug and play is the PCM 3 for a 2004 cayenne that currently has PCM/Nav.

Additionally, the radio FM/AM reception has gotten to be terrible in my CTT. It struggles to pull in local channels that my other cars receive with ease. Will switching out the unit solve this, whats all involved?

Thanks.