Not Ranked
It's a popular misconception that an X-pipe creates 20-30 more HP vs. no crossover or an H-pipe. Personally, I don't like the way X-pipes sound, plus the setup momentarily merges all the exhaust into a single flowpath, which sounds funky. H-pipes sound much better IMO, & there is either none to very minimal gains by using an X-pipe. Two Ford engineers that I used to talk with periodically did tests & studies on this very subject for about a year, & they concluded there was nothing magic about any X-pipe setup.
Also, if you are going to do an H-pipe, the crossover pipe should be about 70% of the diameter of the rest of the exhaust. The crossover should be situated at the "hot spot."
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