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So i have a 1990 f250 with efi, i currently have a k&n cold air intake cut off cats and a really short pipe into a magnafliw muffer it only goes about a foot under the bed. Its a single 3 inch pipe into the muffler. Im lookin for more permormance and i keeo hearing about bells or horns inside the air tubes and to cut these out is it worth it. My other question is my uncle swears by throttle bidy spacers and had got me one fir a gift, but yet to put it in. Are either of these going to do me any good, or just a waste of time.