H pipes give you a lower sound and X pipes have a higher pitched sound as a general rule. X pipes are more efficient and will yield more hp on ther top-end. This is why they are used by some many that race. H pipes have been said to yield a few more ponies down low.
I personally think H pipes sound better, but I have an X.
On our cars, o/r x pipes should only be used with chambered mufflers as you need the chambers for some back pressure. For someone on a budget, an o/r X pipe is a great way to add some sound and some hp if you change nothing else. I think o/r X pipes sound great with Flows...but it's a personal choice.
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