I believe the 08's are the first year the sirius was offered. Agree with the above poster, you would be better off getting a aftermarket radio. The shakers have two speakers in the doors as opposed to the stock one. One is a woofer which uses a different door panel that has a baffle in it. The amps for the woofers are also located in the doors.
You could just upgrade the radio along with the current speakers in the doors and rear deck which are chinese made junk anyway.
AFM Site Administrator2006 Tungsten Grey Mustang GT Manual. Alpine H/U with Infinity speakers. Powerhouse CAI and Tune.
1978 2.8 L, 1979 5.0, 1982 5.0 "HO", 1986 5.0 GT
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