Just from what I have read on the LS1GTO forum. The H pipe will give it more of the traditional v8 musclecar sound. The X pipe give is more of a european v8 car sound.
There are a ton of clips on youtube that you can listen to. Also on the LS1GTO forum in the exhaust section there is a link to a whole lot of exhaust sound clips. You coul spend an hour just listening to them, going back and forth trying to discern the differences between setups.
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