So I have a Pioneer head unit, but I want to get sirius. I was thinking of getting a unit I can pop out and move to the motorcycle. Can you guys show me pictures of where you mounted the unit in your E36's preferably?

Are you talking about the SIR PIO?

Or an outboard controller?

Because on a motorcycle, I'd seriously just get the wearable one.

I want to use it for both with the ability to bring it to different vehicles. This one is brand new and seems to be he best bet. It has a headphone jack with a volume control on the side, plus a FM modulator, plus you can hard wire it to some RCA's in the car.

The onboard controller would be great, but it would be fixed to the car.

I can get it for $60 after rebates with a car and home kit.
http://www.sirius.com/servlet/ContentServer?pagename=Sirius/CachedPage&c=ProductAsset&cid=1107450540448

OK, well you're asking for input in a public forum, so here's some:

FM Modulators suck ass. That's a drawback if anything.

The large-size controllers are impossible to make look clean and OEM. I think they all look Playskool. We only use the Starbase at our store to make them as hideable as possible. The big one that can look best in a BMW is probably the Blaupunkt America - at least it's black plastic.

And how you'll use this thing on a motorcycle scares me. That's why I'm thinking the wearable is a lot better from a usability standpoint. It just costs more money, but you didn't get a BMW to save money, did you? : )