http://ubb.mustangexhaust.com/cgi-bi...?ubb=forum;f=8
check this out.
I have BBK longtubes, o/r x pipe with 2 chamber flows and turn downs. I used to have an o/r h pipe. I like the sound of the x pipe better, but the H pipe is louder. That combo is loud enough that I have to turn the radio up real loud to hear it.