Looking at a 2006 Mustang GT
Discussion
Nothing is essential as the car is good out of the box. The Premium pack and interior upgrade are worth having as the standard interior is too plasticky.
This should tell you all you need to know.
http://bradbarnett.net/mustangs/timel
This should tell you all you need to know.
http://bradbarnett.net/mustangs/timel
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