'd be willing to bet that you could bolt-on a cobalt ss/saturn red-line supercharger to the 2.4. now, whether or not the pistons would melt, i dunno..... but i bet it would be an easy upgrade at least for a while.
now, if i had $20,000 to buy a car, would i buy it? prolly not.
would i think about it? DEFINATELY.
but, i'd have to get something with a backseat, unless it was a second car.