yep , restrictions in the exhast create back pressure . Most people think that you need some back pressure for torque . I sayfor a modified car , the less back pressure the better . torque is easily fixed by the right set of gears .
um, 300 hp for a 302 is a modified car...Fordgazm said:I agree , thats why I said on a modified car . the optimum size would be dictated by the engine .