If the battery hasnt been relocated I highly doubt it has a SC/Turbo in it. Did you pop the hood and look? You cant miss the SC or Turbo!
I wouldnt buy it! Whats the mileage and Year? You can get a Pristine well cared for 2000 SVT for under $11K, check the Classifieds on CEG.
Car sounds beat, the ghetto stereo is prolly due to the OG owner pulling his system out before trade.