But I need to plumb into the bike's radio. I HAVE to use my stock headset. It is integrated and works well. I just want to add into it.

What about a bluetooth receiver that would output to a stereo plug?

Get an autocom or any other basic multiple source audio setup.

Need a quick answer on this from anyone with a zumo.

Looking at a used 550 tommorrow for $300 comes with all the factory accessories, car mount, bike mount, plugs etc... Is there anything I need to look for as far as functionality?

Example?

bluetooth works, unit turns on. You can update the maps and firmware rather easy yourself.

rocketmoto.com use to sell them, you could give them a call.

Thanks. I looked arnd their site. They have lots of good stuff. Maybe one item might do it. I'll have to call em.

Trip,

How do I update the maps on the 550? I have that one on the HD and the last trip I took had me route around a half mile stretch of road that it thought was not there. When on the return trip that I bypassed its route for the shorter easier roadway it was goin ballistic thinkin I was offroading.

garmin.com, you have to buy them

Damn