I have been looking and plan to but the 90BT through Crutchfield when it comes out. BTW I spoke with Crutchfield the other day and they only have 60 preordered and plan to have 250 come in. Anyway I can't seem to find if this unit has a 30G HD like the Z series or if it runs on flash memory only. I like the thought of having the hard drive.

One more question - I have an 08 F450 and I have the factory Sirius installed. I really want to use the existing antenna but I was told that it's impossible to splice together. Anyone know if its possible?

Only flash memory

I really want to use the existing antenna but I was told that it's impossible to splice together. Anyone know if its possible?

you mean the sirius antenna and the factory antenna? either way, i havent been following up on the F series (personally i think its overrated) but if they havent confirmed it already, im sure theyll make somethin like this

http://cgi.ebay.com/SIRIUS-CONNECT-SATE ... dZViewItem

even if you did manage to splice them together, i dont think youd be able to control it thru the unit. with that piece if/when they make it youd be able to

Lots of factory antennas will work with the Pioneer sirius box. You won't really know til you get a look at the connector on the end, or if someone on the board happens to have your car already