The “X” pipe sound doesn’t pulsate between pipes like a true dual or an “H” pipe will. When your at WOT, the exhaust will shriek as if it is turning another 1,000 - 1500 rpm’s higher. It is an awesome sounds, not a crappy one.
The X pipe is ever so slightly better than an H pipe. This is according to the “Engine Masters” show. How much it changes at other HP levels IDK but would bet a weeks check it ain’t much via the price of a change over for us street guys.
You would do much better figuring out how much of a header collector extension the engine wants for added low speed torque more than anything and then add on your cross over before a pressure wave termination box. Make sure you add in the cross over length as a part of the whole of the collector extension length before the pressure wave termination box.
The finish up your exhaust system. Go to a car meet and check out exhausts. Ask the owner what he did and has for “That Sound!”
