Cut open a factory h-pipe you will see in most cases it is actually a very small balancing tube inside the actual exhaust piping that flows very little. It is cheap to produce compared to an x-pipe but it does help better than having no cross-over at all. As far as HotRod magazine goes they are a joke I wouldn't quote them as an authority on anything. There are a couple of really good articles on this subject where extensive dyno and track testing was done and the x-pipe provided noticeable gains of .15 in the 1/4 mile all day long over an h-pipe on a GM V-8 at the strip.I know you did not quote me but I said similar things so....
Like I clearly stated earlier, that is what I have read and if you are such an exhaust expert then maybe you can shed the light on what the purpose of the H pipe application is if it clearly does not provide more hp or torque.
Why would any person/manufacture ever put an H pipe on anything if that was the case, and also since you are the expert I'd like to know why most vehicles that are indended for towing are equiped with an H pipe when there is a dual exhaust present from the factory?
I don't have a problem with ElTejano but people who cut their mufflers off, go from duals to a y-pipe, and otherwise ghetto rig their exhaust on a brand new car are not who I would be taking advice from for my future mods. There are lots of things that can be improved upon production cars like the air intakes but GM doesn't do that either - but it doesn't mean that they are better. The previous poster hit the nail on the head that an x-pipe is a progression of the h-pipe which is why you see that is almost all anyone uses anymore.
But if you want to listen to him go ahead because I will just beat you that much worse if I see you out on the street :slap: