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What is an E83?
SIRIUS on the E83
BMW offers SIRIUS satellite radio on the E83 as a dealer installed option, however, dealers have been known to charge upwards of $800 to install this option. X3 owners can order the BMW SIRIUS tuner and install it themselves (there are a lot of DIY install guides the in the E83 forum). The tuner with wiring kit is $550 from places like Circle BMW (http://www.circlebmw.com/parts/sirius/sirius.htm). The tuner installs in a discrete location and owners control everything through the standard radio interface. If you want a fully integrated SIRIUS, this is the only solution. If you don't want to install it yourself, you can get the dealer to roll their price into your monthly payment.
The BMW SIRIUS solution requires that 2004-2006 E83s are equipped with the option SA-693 "Satellite pre-wire." 2007+ X3s have satellite pre-wiring standard.