Man if you want plug and play go with the car's pre-wired Sirius system...a little more spendy but no splicing and dicing to get it to work with the car's current audio system and I honestly don't know if XM will be compatable with the car most XM adds also have aftermarket decks.
edit: those kits are easy. ive done countless kits with gm vehicles of all kinds, im sure its the same with a bmw. usually just a t-harness and the xm is available thru one of the option menus in the radio after.
I've done that install in my 06 325CI coupe. I took about 20 minutes to hook up and it works great. Your radio has to be "sat ready". You can save 18 presets and see the information on your radio, song, artist, etc.
You need to check your trunk on the left side under the lining for a 6 pin and a 3 pin connector that are taped together above the wheelwell. These are for the CD changer and will plug right into the adapter. You can also add a factory CD changer to the adapter.
The install is invisible except for the antenna that is inside the car just behnd the left headrest. I get good eception with the antenna inside the car.
Well worth the price. You won't be sorry if you purchase that kit. The price is very good also.
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