okay so I'm done with all mods for safety, an been spring cleaning all winter long, now finally time for performance gains I have my fuel pump sitting here an a big mouth cold air, adjustable fuel regulator, and a test pipe. My car Is 100% stock an I was just wondering if I should waste my time on the cat an put on the test pipe or just wait an get an exhaust an leave the cat alone, I don't have to worry about emissions, will it gain or be a loss without any other mods?