Thanks for your question, However I'm not a big car buff I don't know really what the real difference is with them. The car does however say it is bonneville SSei turbo.
I was informed at the time by the dealership that it is what it says. I don't remember if my ad says its a supercharged engine but I will look at the ad again. And I Know for a fact that it is a V-6 turbo with all the gauges. thanks again.

My SSEi has a boost gauge as well for the factory installed supercharger (which does the same thing a turbo does, but is belt driven). All SSEi'* are supercharged from the factory. If it does, in fact, have a turbo on it, it is aftermarket. If this is the case, I'd love to see pics of the enging bay, if you don't mind...

Wait a sec...you say the car itself says "Turbo" on it?!?! Is there any way you can snap a pic of that for me?? If this is the case, I may look more seriously into buying that car...In fact more pics would be greatly appreciated!!!