2004 Mach I, H-Pipe or X-Pipe?

Looking at some exhaust parts and I was wondering what would be louder, an H-Pipe or a X-Pipe? I'm going for some SLP Loudmouth II exhaust pipes and hopefully something that will shake the cars around me when I'm sitting at a red light. Other exhaust combinations that may be good for this type of application would be appreciated also, although I'm pretty well set on the SLP LM II's