I listened to some clips of exhausts on YouTube.com. The best one I heard was of a Mercury Marauder with an H-pipe. He had a clip of the same car with an X-pipe, but the H-pipe sounded better, outside the car anyway. What would the difference be inside the car in regards to drone. I hear the X-pipe is good for the drone inside. Does an H-pipe do the same? Also, does the placement of the H or X-pipe make a difference?