For the exhaust after the cats,, think about where you're going to be spending the most time in the rev range. An x-pipe design may sacrifice some low-end torque, but will open up more potential hp at the top-end. Alternatively, an h-pipe can offer more low-end torque at the cost of top-end potential. Our cars aren't known for low-end torque, so a lot of people go with an x-pipe.
My car is my daily driver, so I'm liking the low-end that the AAM h pipe gives me.
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