Feedback in the Comm from the GPS ?

[Wicked Stick]

Just finished installing my entire panel in the plane. (RV-8)

Last night I turned everything on and started playing with it and setting it all up so that they all talk to each other. (GPS, EFIS, Autopilot, Radios)

I'm getting some random static reception on my I-Com 210 and it seems to be coming from my Garmin 496 GPS. It's worse on certain frequency ranges but it's there nonetheless. It only shows up when the NMEA In/Out options are turned on in the GPS setup. I know this allows the GPS to feed the radio with frequencies of the "direct to" airport and surrounding air traffic control numbers, but I'm not sure why it also seems to feed it static on the comm frequency.

I have the following in my panel. AF3500 EE, PMA9000EX intercom, SL30, I-Com210, GTX327 transponder, ADI Pilot II and the GPS496.
Everything is hooked up via a Fast Stack Hub with their pre-made wiring harnesses. I have all the grounds located in one spot.

Any suggestions on how to fix it?