What I find interesting about the whole paint job, is that it was the most "Labor intensive" way to go.
I'm assuming the SRT was originally black, and they added the silver, (and if done correctly) they would have to remove the rear deck lid, the hatch that covers the folded top, and the hood, to paint the underside of all three panels. Not to mention the engine bay as well.
Now if my eyes are deceiving me, and the car was originally SSB, and they added the black paint, then it would have been a much easier job.
I'm guessing, more than likely, the underside of those 3 panels (and the engine bay) is probably still coated in the "Factory" black paint.
The Chrysler dealer that was closest to me custom painted the last 3 Crossfires they had on their lot. It's a desperate (but not uncommon) tatic some dealers used to draw attention to cars that they were unable to "move off the lot" for an extended period of time.