Is this more of an X pipe or H pipe ?

MrPerfect2 said:

Looks like Some X pipes are more pronounced in blending gases more smoothly then others . I saw a video of flow that demonstrated - I have the top X and 2 cats on it and plan to use 44s or maybe super 40s ( original 40s are known to drone hard )

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Correct, but in order for them to have any real scavenging effects, the X would have to located much closer to the engine than is anyway practical on a Mustang. That is based on a statement by Dr. Gas, the original X-pipe manufacturer for the Mustang. At the point in the exhaust where it is possible to put any crossover in, they all work basically the same. There have been several published dyno shoot outs comparing exhaust intermediaries, and all the intermediaries were about the same, even the old school H-pipe. It seems the Mac Pro-Chamber usually eeks out an extra hp or two, but an amount too negligible to be considered. If you ran the same car on back to back dyno pulls, the power is going to be a little different.

Kurt