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prochamber is deeper sounding than a regular o/r h. its due to the chamber, kinda like how a catted h soundsbut louder, its the deepness that makes the difference though.
You can get both with no cats. The prochamber is a little deeper, and sounds good with Flowmasters. I suggest going here http://www.mustangexhaust.com/forums...ps.php?catid=5 just select which muffler and you can hear other people's set up with that muffler. This way you can decide which you like better.