h pipe vs x pipe

I have a quick question i was reading on www.mustangexhaust.com and they were talking about the differences between x pipes and h pipes and i was wondering if what they said was true. they said the h pipes gave a deeper sound and x pipes gave a more exotic sound. Is this true and has any one installed either.
If you guys could help me i would appreach it alot thanks

Alex

here the exact link http://64.177.72.121/forums/showthread.php?t=14956