"X"pipe vs. "H"pipe

ok, so today my friend goes..."hey, why didnt you get a X-PIPE?" and then i think to myself...ummm, i dunno. so im asking anyone who knows, what exactly is the difference between the X-pipe and the H-pipe. to me, they look like they do pretty much the same thing. your help will be much appreciated. thanks!
 
they will only add 1-2 hp on an even fire V6 like the 3.8. they work great on V8`s because they have an odd fireing order and the x or H balances out exhaust pulses between cylinder banks. V8`s can see 5-8hp with them an even fire V6 1-2hp if any at all

they will make the exhaust note alittle more quiet also
 
woah 77 sleeper finally got it right! I chose the X because in my research, the X is going to give you more viscosity on your exhaust, giving you a little more hp on it, plus the sound is quite a bit louder, however that was one i had misunderstood. You can either go with or without cats on both pipe setups. I have cats (for now) on my X pipe.

And Lynx, yes the X will give you a low rumble. Listen to my exhaust right as it cranks up and at idle...i've been told it sounds somewhat like a jet boat.
 
I recently put a MAC H pipe w/o cats on my 2000 mustang, it sounds awsome. really deep, except at really high rpm. I could tell a fairly noticable increase in HP. I know most people say it doesn't help much, but it does. definitly go with the H pipe.