I traded in my 06 cobalt for my new Aveo. Here's the deal, my view of the Cobalt, and I had an LS model was that it was no slouch as it was. I didn't care for much of the car, but the performance was one thing I never had much of a complaint about.
Was it a race car? Not by any means, but for a 2.2L engine, it had some get-up-and-go.
I imagine with a turbo, or even a supercharger, the car has to be pretty spiffy.
I just never could justify the cost to buy one.