fan blades

at http://www.carparts.com they sell fan blades as a universal application, and say that they increase air flow and horsepower. I mainly liked the look, but wouldnt complain about the extra horse and cooler air. Anyway would anyone know if they would fit our cars? Would they need minor modifications or is it a clean install? Someone check it out or give me some feedback if you have one please. Thank you.:stuck_out_tongue: