The problem is when I am either at 1500 rpm or 3000 I get this rattling from under the car. Is it my head shields or something else and would could I do to fix it.
Also when I am in first or second gear and I bring the rpm's up to about 3500 I hear this weird buzzing sound. Could it possibly be the muffler (bought off ebay), or could if maybe be my valves floating?