I'm all for saving money, but I doubt cherry bombs will sound as good as the Corsa, not to mention the drone elimination Corsa is known for.... In addition, those cherry bombs are prone to quick rusting. I've dealt with them on my older muscle cars. After a year or two, they were shot. If your looking to save $$$, at least get a quality glass pack from the Summit/Jegs catalogue. If memory serves, quality pieces for $60-$100 each. Not sure if any HP/Torque will be gained, but will definately give a distinct sound.
My .02