I believe you are correct with your memory of an announced production run of no more than 500 per year.
To date, I believe Saleen produced less than 100 Challengers total.
The early 2009 models were powered by naturally aspirated 6.7 Liter stroker motors. These 570s were not supercharged. The 2009 570X models were supercharged.
For 2010 both the 570 and 570X were supercharged.
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