Ok I have a 2007 2.2 cobalt. I plan on doing a lot of mods including all the basic bolt on mods, port-polish, shave the heads, new tb, manifold swap, new cams and a bunch of internal work. Stock I have a 148 HP and might be hitting around 180 after all my mods. My question is should I decide to swap my 2.2 out for a 2.4 motor rated at 171 HP then go from there? I'm assuming the cost will be roughly the same for the swap or a bunch of mods for my 2.2. The gas mileage is the same for both motors but the 2.4 requires a higher octance gas. Is it worth it to swap the engine or should I just stick with the 2.2 and mod that. B-low I'll be waiting for your opinion here.