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I know that the factory "H-pipes" were a great improvement over separate dual exhaust pipes. New data seem to indicate that "X-pipes" are an improvement over "H-pipes." However, are these pipes of any benefit over headers with only open headers and mufflers? Do they provide benefit only with...

I know the benefit of using an H- or X-pipe in an exhaust system; however, is the benefit achieved only with a full exhaust system? I know the science of using the exhaust pulses to better scavenge the exhaust pipes, but will that matter on a shorter system? My plan is to have side exhaust...