Will the sirius adapter work from the D3 to the F900BT? I am wanting to upgrade to the F900BT but i need to make sure some stuff still work. I obviously have to get the iPod adapter, but is the wire harness the same and the sirius adapter capable of working on this unit? Any info would be great!!

Yes

yes to both or yes to the sirius adapter? or yes to the wire harness?

also is there already a tread going on about compatiblity from the D3 to the new F9 series?

Yes to both. Different antenna and RCA plug though

ok last question...... if i have the D3 bypass done on it, with the wire harness being the same will the bypass in turn work for the F900bt?

The D3 does have the same wiring harnesses, but the pin location for the bypass is different between the two units. So you will have to move that mute wire again, like you did with the D3, only to another location. See the F-series bypass topic for the proper pin location.

So basically, you pull the plugs out of the D3, move the mute wire, and plug in the new unit.