sell your car and buy an SS/TC. going to be a lot cheaper and easier for you. if you turbo your car, you'll probably blow it up and spend another 4 grand to rebuild the engine like i am right now.
Statements like this always frustrate me... And here's why...
A quick search on virtually any site such as Autotrader, CarMax, etc will turn up similar results... Selling a non turbo, or charged Cobalt with a reasonable amount of miles on it, is going to get you between $5k and $8k (depending on year, mileage, options, etc).
On that same search,
if you're lucky enough to even find a turbo'd Cobalt, you'll notice the price is
AT LEAST $10k
higher than the price of the regular Cobalts. $10k can pay for a
lot of mods.
On top of that, none of us, short of the owner of the Cobalt in question, KNOW what his/her plans are for the Cobalt. If he/she wants a 10 second car, they're going to be dropping a ton of money into whatever it is they're driving... If they're just wanting to make what they already have a little more fun to drive, look good / better etc, then there's not a thing in the world wrong with working with what you have.
I can appreciate the advice given as a heads up to what happened when you turbo'd your Cobalt, but like I mentioned earlier, the statement "sell your car and get _____" has always frustrated me, and imo, is usually NOT good advice.