2006 GT with factory Whipple supercharger?

I've been driving myself crazy trying to research a car I want to buy. It's a 2006 GT Premium Convertible. The hiccup is that I've been told that the Whipple supercharger was a factory option that year. I like to do my research, but can't seem to find any info that supports that statement. From my knowledge I thought only certain editions came supercharged (Shelby, Saleen, Rousch). Can anyone help out? I've paid for 3 VIN reports and still no mention of a factory supercharger and I can't seem to locate a build sheet. Thanks for any responses in advance.

Scott
 
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